JP6696551B2 - Imaging device - Google Patents

Description

  The present invention relates to an image pickup device.

  BACKGROUND ART An image pickup apparatus that picks up an “omnidirectional image” corresponding to a solid angle of 4π radians at one time is known from Patent Documents 1 and 2.

  As an imaging device for "imaging the celestial sphere at one time", one using two "wide-angle lenses (so-called" fisheye lens ") having a total angle of view exceeding 180 degrees" is known (Patent Documents 1 and 2). ..

  Since such an image pickup device can simultaneously acquire omnidirectional image information, it can be effectively used for, for example, a security surveillance camera or an in-vehicle camera.

  Further, in recent years, it is also intended to be used for industrial and medical endoscopes.

  As the total angle of view of the wide-angle lens increases, the number of constituent lenses tends to increase in order to ensure performance, and the wide-angle lens with a large total angle of view tends to increase the total lens length.

  When two wide-angle lenses having such a large total lens length are combined, the size of the image pickup apparatus itself tends to increase.

  In consideration of such "increase in size", there has been proposed one in which the optical axis of a wide-angle lens is bent by a reflecting surface (Patent Document 3).

An object of the present invention is to realize a novel image pickup apparatus that uses two image pickup optical systems each having a wide-angle lens having a total angle of view exceeding 180 degrees .

The image pickup apparatus according to the present invention includes an image pickup optical system including an image pickup optical system having a total angle of view larger than 180 degrees and an image pickup element for converting an image formed by the image pickup optical system into an image signal. An image pickup apparatus for picking up images in combination , wherein each of the two image pickup optical systems to be combined has a first lens group arranged on the object side and a first lens group arranged on the image side of the first lens group. Two lens groups and a reflecting surface member are provided. The reflecting surface member is a first reflecting surface that bends the optical axis of the first lens group in a first direction, and is reflected by the first reflecting surface. And a second reflecting surface that bends the optical axis of the light flux in a second direction different from the optical axis of the first lens group and the first direction.

According to the present invention, it is possible to realize a novel image pickup apparatus which uses two image pickup optical systems each having a wide-angle lens having a total angle of view exceeding 180 degrees .

It is a figure for explaining one embodiment of an imaging device. It is a ray diagram in the embodiment of FIG. It is a figure for demonstrating another form of implementation of an imaging device. 4 is a ray diagram in the embodiment of FIG. 3. FIG. It is a figure for demonstrating 1st Embodiment provided with the illumination means.

Embodiments will be described below.
FIG. 1 is a conceptual diagram for explaining an embodiment of an image pickup apparatus.

  The image pickup apparatus according to the embodiment shown in FIG. 1 has two image pickup optical systems.

  Hereinafter, these two image pickup optical systems will be referred to as a first image pickup optical system and a second image pickup optical system.

  (A-1) and (a-2) of FIG. 1 are diagrams for explaining the first imaging optical system, and (b-1) and (b-2) are for explaining the second imaging optical system. FIG.

  The "first imaging optical system" will be described with reference to FIGS. 1 (a-1) and 1 (a-2).

In FIGS. 1 (a-1) and 1 (a-2), reference numeral L1I indicates a "first lens group". Further, reference numeral L1II indicates a “second lens group”.
Reference numeral IS1 indicates a “solid-state image sensor (hereinafter, referred to as first image sensor IS1)”.

Further, the symbol PC indicates a "reflection surface member".
In FIG. 1A-1, the left side of the figure is the object side.

  The first lens unit L1I is a lens unit disposed on the object side and has a “negative refractive power”, and in this example, it is composed of two lenses L11 and L12.

  The second lens group L1II is a lens group disposed on the image side of the first lens group L1I and has “positive refractive power”, and is composed of five lenses L13, L14, L15, L16 and L17.

  Specifically, the lenses L11 and L12 of the first lens unit L1I are both “negative meniscus lenses made of glass material”.

  The lenses L13 and L14 of the second lens unit L1II are both "biconvex lenses made of glass material", and the lens L15 is "biconvex lenses made of glass material".

  The lens L16 is a “concave lens made of a glass material” and is joined to the lens L15.

  The lens L17 arranged closest to the image side is a “biconvex lens made of a glass material”.

  The second imaging optical system will be described with reference to FIGS. 1B-1 and 1B-2.

  In FIGS. 1B-1 and 1B-2, the symbol L2I indicates the “first lens group”. Further, reference numeral L2II indicates a "second lens group".

  Reference numeral IS2 indicates a “solid-state image sensor (hereinafter, referred to as second image sensor IS2)”.

Further, the symbol PC indicates a "reflection surface member".
In FIG. 1B-2, the right side of the figure is the object side.

  The first lens group L2I is a lens group arranged on the object side and has a "negative refractive power", and in this example, is composed of two lenses L21 and L22.

  The second lens unit L2II is a lens unit disposed on the image side of the first lens unit L2I and has a "positive refractive power", and is composed of five lenses L23, L24, L25, L26 and L27. ..

  Specifically, the lenses L21 and L22 of the second lens unit L2I are both “negative meniscus lenses made of glass material”.

  The lenses L23 and L24 of the second lens unit L2II are both "biconvex lenses made of glass material", and the lens L25 is "biconvex lenses made of glass material".

  The lens L26 is a “biconcave lens made of a glass material” and is joined to the lens L25.

  The lens L27 arranged closest to the image side is a “biconvex lens made of a glass material”.

FIG. 1 (a-2) is a view of the state of FIG. 1 (a-1) viewed from the "right side of the drawing".
Further, (b-1) is a diagram of the state of (b-2) viewed from "right side of the figure".

  FIGS. 1 (c-1), (c-2), and (c-3) are diagrams for explaining a state in which the first imaging optical system and the second imaging optical system are combined.

  FIG. 1 (c-1) shows a state in which the first and second image pickup optical systems are combined, as seen from a direction orthogonal to the drawings of (a-1) and (b-2).

  The second lens units L1II and L2II overlap each other in the direction orthogonal to the drawing. Similarly, the first image sensor IS1 and the second image sensor IS2 also overlap each other in the direction orthogonal to the drawing.

  FIG. 1 (c-2) shows a state in which the first and second image pickup optical systems are combined, as seen from a direction orthogonal to the drawings of (a-2) and (b-1).

  FIG. 1C-3 is a state in which “a state in which the first and second imaging optical systems are combined” is viewed from above in the diagrams of (a-1) to (b-2).

  Next, the reflecting surface member PC used in the embodiment of FIG. 1 will be described.

  In the embodiment of FIG. 1, the first imaging optical system and the second imaging optical system share the reflecting surface member PC.

  That is, the reflecting surface member PC is a “component of the first image pickup optical system” and is also a “component of the second image pickup optical system”.

  The reflecting surface member PC is composed of three parts, as shown in FIG. These three parts are a cubic prism P0 and triangular prisms P1 and P2.

  As shown in FIG. 1 (c-3), the prism P0 is formed by laminating two triangular prisms on an inclined surface, and the joint surface RF is a reflecting surface.

  As shown in FIG. 1 (c-2), the imaging light flux incident from the first lens group L1I of the first imaging optical system is reflected toward the triangular prism P1 by the joint surface RF of the prism P0.

  That is, the cemented surface RF of the prism P0 bends the optical axis of the first lens unit L1I toward the side of the triangular prism P1 that is the first direction. The bending angle is 90 degrees.

  Similarly, the imaging light flux incident from the first lens group L2I of the second imaging optical system is reflected toward the triangular prism P2 by the cemented surface RF of the prism P0.

  That is, the cemented surface RF of the prism P0 bends the optical axis of the first lens unit L2I toward the side of the triangular prism P2 that is the second direction. The bending angle is 90 degrees.

  Therefore, the "bonding surface RF" of the prism P0 is not only the first reflecting surface of the first imaging optical system but also the first reflecting surface of the second imaging optical system.

  Below, the joint surface RF is also referred to as the first reflecting surface RF.

  The imaging light flux incident from the first lens group L1I is reflected by the first reflecting surface toward the triangular prism P1 side, is reflected again by the inclined surface, and is incident on the second lens group L1II.

  At this time, the optical axis of the first lens unit L1I is bent 90 degrees toward the direction of the second lens unit L1II, which is the “second direction”, and coincides with the optical axis of the second lens unit L1II.

  That is, the inclined surface of the triangular prism P1 is the "second reflecting surface" of the first imaging optical system.

  The imaging light flux incident on the second lens group L1II is a two-dimensional image (hereinafter referred to as “first two-dimensional image”) on the light receiving surface of the first imaging element IS1 due to the image forming action of the first lens group L1I and the second lens group L1II. Image is formed.

  The same applies to the second imaging optical system.

  That is, the imaging light flux that has entered the prism P0 from the first lens unit L2I is reflected by the first reflecting surface RF toward the triangular prism P2 side.

  Then, it is reflected again by the inclined surface of the triangular prism P2 and enters the second lens unit L2II.

  At this time, the optical axis of the first lens unit L2I is bent 90 degrees toward the direction of the second lens unit L2II, which is the "second direction", and coincides with the optical axis of the second lens unit L2II.

  That is, the inclined surface of the triangular prism P2 is the "second reflecting surface" of the second imaging optical system.

  The imaging light flux that has entered the second lens group L2II is a two-dimensional image (hereinafter referred to as “second two-dimensional image”) on the light receiving surface of the second image sensor IS2 due to the imaging action of the first lens group L2I and the second lens group L2II. Image is formed.

  Both the first image pickup element IS1 and the second image pickup element IS2 have a “two-dimensional light receiving surface”, and a two-dimensional image formed on this light receiving surface is imaged and converted into an electric signal.

  The “first two-dimensional image” captured by the first image sensor IS1 and the “second two-dimensional image” captured by the second image sensor IS2 have the same image information in the peripheral portions.

  That is, since the first image pickup optical system and the second image pickup optical system are formed by the image forming optical system having a total angle of view larger than 180 degrees, the image information picked up by the image pickup elements of each other has an overlapping region. There is.

  Therefore, this same image information (image information of the overlapping area) is detected as a "connection position", distortion correction is performed by electrical information processing, and then developed on a plane, and then "blend processing" is performed to obtain one image. Connect to.

  In this way, an "omnidirectional image" can be obtained.

  As described above, the image pickup apparatus according to the embodiment shown in FIG. 1 includes a "imaging optical system having a total angle of view larger than 180 degrees, and a two-dimensional image converting an image formed by the imaging optical system into an image signal. It is an "imaging device that captures an omnidirectional image by combining two imaging optical systems including a solid-state imaging device".

  The two imaging optical systems have the same structure, and each has a first lens group L1I, L2I arranged on the object side and a second lens group L1II, L2II arranged on the image side of the first lens group, And a reflective surface member PC.

  The reflecting surface member PC has a first reflecting surface RF and a second reflecting surface.

  The “first reflecting surface” is a reflecting surface that “bends” the optical axes of the first lens groups L1I and L2I in the “first direction” and is the “junction surface RF of the prism P0”.

  The "second reflecting surface" is a drawing of the common plane including the optical axis of the light flux reflected by the first reflecting surface RF and the "optical axis of the first lens group and the first direction (FIG. 1C-3). Is a reflective surface that is bent in a second direction (a surface that is orthogonal to the drawing of FIG. 1C-3) intersecting the “parallel surface”.

  The “second reflecting surface” is the slope of the triangular prism P1 in the first imaging optical system and the slope of the triangular prism P2 in the second imaging optical system.

  In the two image pickup optical systems, the optical axes of the first lens units L1I and L2I match each other, and the shared planes are “in the same plane (the plane shown in (c-3) in FIG. 1)”. ..

  The "second directions" are combined so that they are on the same side of the same plane.

  In the embodiment of FIG. 1, the reflecting surface member PC of each image pickup optical system is also a prism having a first reflecting surface RF and a second reflecting surface (the inclined surfaces of the triangular prisms P1 and P2).

  The first direction is orthogonal to the optical axes of the first lens units L1I and L2I, and the second direction is orthogonal to the first direction.

  The two image pickup optical systems share the reflection surface member PC.

FIG. 2 shows a ray diagram of the embodiment described above.
FIG. 2A is the same diagram as FIG. 1C-3.

  FIG. 2B shows a ray diagram in the state of FIG. 1C-1.

  FIG. 2C shows a ray diagram in the state of FIG. 1C-2.

  FIG. 3 is a diagram schematically showing another embodiment of the image pickup apparatus.

  In order to avoid complexity, the parts which are not likely to be confused are given the same reference numerals as in FIG.

  The image capturing apparatus described in the embodiment with reference to FIG. 1 can capture an image in all directions corresponding to a solid angle of 4π radians at one time. The "optical system of the image pickup apparatus capable of picking up images in all directions" is referred to as "large-field optical system" for convenience sake.

  The image pickup apparatus according to the embodiment shown in FIG. 3 is obtained by adding a “small field optical system” to the “image pickup apparatus having a large field optical system” shown in FIG.

  In FIG. 3A, reference numeral SKIII indicates a “small field optical system”.

  FIG. 3B shows a portion excluding the second lens unit L2II of the second imaging optical system from the state of FIG. 3A for the sake of simplicity of illustration.

  As shown in FIG. 3B, the small-field optical system has a first lens group L3I, a second lens group L3II, and a third image sensor IS3.

  The first lens group L3I is a single negative lens (negative meniscus lens), and the second lens group L3II is composed of five lenses and has a positive refractive power.

The third image sensor IS3 is a solid-state image sensor having a two-dimensional light receiving surface.
The first lens unit L3I and the second lens unit L3II form a "small-field imaging lens system". The third image sensor IS3 is a "small field solid-state image sensor".

  The first lens group L3I and the second lens group L3II “share the optical axis”.

  FIG. 3C shows the state shown in FIG. 3A as viewed from above.

  The optical axis AX of the first lens unit L3I is “a plane that is orthogonal to the vertical direction of the drawing in the shared plane of the two imaging optical systems (in FIG. 3A, and is parallel to the drawing in FIG. 3C). Is substantially orthogonal to the same plane that includes ".

  Therefore, the optical axis of the second lens group L3II is parallel to the optical axes of the first imaging optical system and the second lens groups L1II and L2II of the second imaging optical system.

  As shown in FIG. 3C, the prism P0 of the reflecting surface member PC is formed by joining two triangular prisms P01 and P02 at the joint surface RF, and the joint surface RF forms a “first reflecting surface”.

  The optical axis AX of the imaging lens system for the small field of view is set so as to pass through the inside of the prism P02 which is one of the two triangular prisms forming the prism P0.

  Then, the imaging lens system for the small field of view is configured so that the imaging light flux passing through the inside of the lens transmits only the inside of the prism P02 and “does not intersect with the first reflection surface RF”.

  Therefore, the "imaging light flux for the small visual field" that is focused on the third image sensor IS3 is not affected by the reflection action of the first reflecting surface RF.

  That is, the image pickup apparatus according to the embodiment shown in FIG. 3 includes small-field image forming lens systems L3I and L3II having an optical axis AX that is substantially orthogonal to the same plane including a shared plane of two image pickup optical systems, and It has a small-field solid-state image pickup element IS3 for picking up an image by the imaging lenses L3I and L3II via a common plane.

  FIG. 4 shows a ray diagram in the embodiment of FIG.

  FIG. 4 is a ray diagram in the state shown in FIG.

  FIG. 4 also shows light rays in the second lens group L1II and L2II of the first and second image pickup optical systems together with the light rays of the second lens group and below of the small-field imaging lens system.

  Supplementally, the imaging optical system shown in the embodiments in FIGS. 1 and 3 can be used as its application, for example, as a “head portion” of an endoscope for industrial use or medical use.

  As a specific example, assume a case where the image pickup apparatus of FIGS. 1 and 3 is used as a head section of an “medical endoscope”.

  The image pickup apparatus shown in FIGS. 1 and 3 can be realized with a size of about 12 mm in the left-right direction in FIGS. 1C-1 and 3A.

  Therefore, for example, when observing the esophagus of the human body or the inner wall of the stomach, the imaging device of FIGS. 1 and 3 is configured as a “head part of a flexible endoscope” and is orally inserted from the head part side for observation. it can.

  At this time, an "omnidirectional" image can be acquired for the head portion, so that extremely efficient and accurate observation is possible.

  Alternatively, when the image pickup apparatus of FIGS. 1 and 3 is used as a head portion of a “rigid endoscope” to perform, for example, a stomach operation, the surgeon defines a “blind spot” in all directions including the portion to be operated. Can be observed without.

  When such an operation is performed, it may be desired to observe an “image of high resolution and high magnification” for the “necessary part such as an excised portion” together with an omnidirectional image.

  In such a case, for example, when the image pickup apparatus of FIG. 1 is used, a “required area” in the omnidirectional image can be designated and this portion can be enlarged by “digital image processing”.

  However, in this case, the "pixel information included in the image to be magnified" does not change, so the magnified image does not have high resolution.

  In such a case, the light-receiving image of the third image pickup element IS3 can be displayed by using the image pickup apparatus shown in FIG. 3 and the above-mentioned “small-field optical system” if necessary.

  The small-field optical system does not need to have a "large field of view", the imaging magnification can be set large, and "a high-resolution / high-magnification image of a necessary portion" can be observed by the light-receiving image of the third image sensor IS3.

  In this case, the image pickup apparatus of FIG. 3 is provided at the tip of the rigid endoscope, and the optical axis of the small-field optical system is aligned with the longitudinal direction of the “operation rod of the rigid endoscope”.

  Therefore, the first lens unit L3I of the imaging lens system in the small-field optical system can be easily directed to a desired portion.

  By the way, assuming that the image pickup apparatus shown in FIGS. 1 and 3 is used as an industrial or medical endoscope, in this case, the “observed part” is generally dark.

  Therefore, in such a case, an illumination means for illuminating the observation site is required.

  Considering that the imaging device can acquire “omnidirectional images”, the illumination means in this case is only in front of the device (FIG. 1 (c-1) or the upper part of FIG. 3 (a)). Of course, it is necessary that the peripheral part on the side of the device can be illuminated.

  Considering the size and application of the image pickup device, it is preferable to use a plurality of white LEDs as the illumination means. When illuminating the entire periphery of the imaging device, it is preferable to use seven or more LEDs.

  In the case of illuminating the front of the device and the periphery of the side, it is preferable to use five white LEDs.

  That is, it is preferable to have at least five white LEDs as illumination means in a housing that houses two image pickup optical systems or two image pickup optical systems and a small-field optical system.

  Three of these five LEDs are arranged between the first lens group of the first image pickup optical system and the first lens group of the second image pickup optical system.

  The other two LEDs are arranged at positions on both sides of the surface including the optical axis of the second lens group of the first image pickup optical system and the second image pickup optical system in the plane orthogonal direction.

  Then, these five LEDs illuminate the front and side.

  FIG. 5 shows an example of an embodiment in which such five “white LEDs” are provided in the image pickup apparatus shown in FIG.

In FIG. 5, reference numerals 11 to 15 denote first to fifth white LEDs.
Further, in FIG. 5, reference numeral HS indicates a “housing” of the image pickup apparatus.

  In FIG. 5A, the housing HS and the parts except the LEDs 11, 12, 14, and 15 are the same as those shown in FIG. 1C-1.

  Further, in FIG. 5B, the housing HS and the parts except the LEDs 11, 12, 13, and 14 are the same as those shown in FIG. 1C-1.

  In order to avoid complication of the drawing, in FIGS. 5 (a) and 5 (b), the same parts as those in FIGS. 1 (c-1) and 1 (c-2) are omitted from the reference numerals.

  In this example, the housing HS is formed of “a material that is entirely transparent” such as transparent plastic and accommodates two image pickup optical systems in the image pickup apparatus. However, the first lens of the first and second image pickup optical systems is housed in the housing HS. The lens surface of the lens closest to the object in the group is exposed to the outside of the housing.

  The LEDs 11, 12, and 13 are arranged between the first lens group of the first image pickup optical system and the first lens group of the second image pickup optical system.

Then, the LED 11 illuminates a front area (upper side in FIG. 5) of the image pickup device, and the LEDs 12 and 13 illuminate a “front area and left and right lateral areas”.
Further, the LEDs 14 and 15 illuminate a lateral area in the rear part of the image pickup device.

In this way, the front and side areas of the imaging device are illuminated.
The white LED generally has a “Lambertian distribution” in the angular distribution of light emission and has a very large divergence angle, so that the “rear region of the image pickup device” is also illuminated by the LEDs 14 and 15.

  In order to more effectively illuminate the rear area of the image pickup device, for example, two LEDs may be added so that the illumination area effectively extends to the rear area.

  When the image pickup apparatus has a “small field optical system” in addition to the first and second image pickup optical systems, the LED 11 may be arranged so as to avoid the first lens group L3I of the small field optical system.

  Needless to say, the role of the "illuminating means" is to illuminate the image pickup target by the image pickup device, but also has the following role.

  Consider a case where the image pickup apparatus according to the embodiment of FIG. 5 is used as, for example, a “medical endoscope”.

In this case, the inside of the living body into which the endoscope is inserted is “humidity: 100% state”.
As described above, the lens surface of the lens closest to the object in the first lens group of the first and second imaging optical systems is exposed to the outside of the housing, so that the lens surface becomes cloudy in use.

  In the embodiment of FIG. 5, the heat of the LEDs 11, 12, 13 is transmitted to the “lens whose lens surface is exposed to the outside”, and the heat can prevent “clouding of the lens surface”.

  As described above, according to the present invention, the following image pickup device can be realized.

[1]
An image pickup apparatus that takes an image by combining two image pickup optical systems each including an image pickup optical system having a total angle of view larger than 180 degrees and an image pickup device that converts an image formed by the image pickup optical system into an image signal. The two image pickup optical systems to be combined each include a first lens group L1I, L2I arranged on the object side and a second lens group L1II arranged on the image side of the first lens group. , L2II and a reflection surface member PC, the reflection surface member PC includes a first reflection surface RF for bending the optical axis of the first lens group in the first direction and the first reflection surface. An image pickup apparatus comprising: a second reflecting surface that bends an optical axis of a reflected light beam in a second direction different from the first axis and the optical axis of the first lens group.
[2]
The image pickup apparatus according to [1], wherein the two image pickup optical systems are combined so that the first directions are different from each other and the second directions are the same.

[3]
[2] The imaging device according reflecting surface member PC individual imaging optical system, the first a prism having a reflecting surface and the second reflecting surface, said first direction is the first lens group L1I, the imaging device perpendicular to the optical axis of L2I, the second direction is perpendicular to the first direction.

[4]
[3] The imaging apparatus according, the two imaging optical system, an imaging apparatus sharing the reflecting surface member PC.

[5]
[2] or [3] or [4] The imaging device according the same plane including the shared plane containing said at two imaging optical system, and said first direction and the optical axis of the first lens group An imaging lens system L3I, L3II for a small field of view having an optical axis substantially orthogonal to, and a solid-state image sensor IS3 for a small field of view that captures an image by the imaging lens system L3I, L3II via the shared plane. An imaging device having a small-field optical system.

[6]
[5] In the image pickup apparatus, wherein the reflecting surface member PC is, a prism having a first and second reflecting surfaces, the first direction is perpendicular to the optical axis of the first lens group , the second direction has been made to perpendicular to the first direction, said reflecting surface member PC is shared by the two imaging optical system, said first reflecting surface RF is triangular prism P01, is formed as a bonding surface of the P02, the optical axis AX of the imaging lens system passes only one P02 of the triangular prism, the imaging light beam by the imaging lens system, an imaging apparatus that does not intersect with the RF bonding surface ..

[7]
The imaging apparatus according to any one of [2] to [6], in a housing that houses the two pieces of imaging optical system or said two imaging optical system and the small field of view optical system, at least 5 of from LED11 no white has 15 as illumination means, said three of the at least five LED, the two first lens and the two imaging group of one of the imaging optical system in the imaging optical system is disposed between the first lens group of the other imaging optical system in the optical system, the other two LED of the at least five LED, the light of the second lens group of the two imaging optical system An imaging device which is arranged at positions on both sides of a plane including an axis in a plane orthogonal direction and which illuminates the front and side by the at least five LEDs.

  In the above embodiment, the “imaging lens system” in the first and second imaging optical systems used has a focal length of f, an angle of view of θ, and an image height of y of “y”. The so-called "equal distance projection method" is used.

  In the equidistant projection method, “the image height distance from the center of the image to the periphery: y is proportional to the incident angle: θ”, and it is possible to use a large number of peripheral pixels on the two-dimensional light receiving surface of the solid-state image sensor. I can.

  Therefore, if the optical performance (MTF) is resolved "almost uniformly to the periphery", a uniform image can be acquired in the entire screen.

  In the image pickup apparatus of the present invention, the two solid-state image pickup elements IS1 and IS2 that receive the respective images of the two image pickup optical systems can be arranged on the same side with respect to the reflection surface member PC.

  Therefore, it is easy to assemble the solid-state image pickup device, and it is easy to route the flexible wiring.

The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described specific embodiments, and unless otherwise specified in the above description, the invention described in the claims. Various modifications and changes can be made within the scope of the above.
For example, in the above-described embodiment, the bending of the optical axis in the first direction by the first reflecting surface and the bending of the optical axis by the second reflecting surface are 90 degrees, but the bending angle is not limited to this. Absent.

  Also, as the reflecting surface member, the case where the triangular prisms P1 and P2 are joined to the prism P0 is shown, but the present invention is not limited to this, and the triangular prism P01 portion and the triangular prism P1 portion of the prism P0 have an integral structure. Good.

  Similarly, the triangular prism P02 portion and the triangular prism P2 portion of the prism P0 may have an integral structure.

  The effects described in the embodiments of the present invention are merely enumeration of the suitable effects resulting from the invention, and the effects according to the invention are not limited to "the effects described in the embodiments".

L1I First lens group of first imaging optical system
L2I First lens group of second imaging optical system
L1II Second lens group of first imaging optical system
L2II Second lens group of second imaging optical system
PC reflective surface member
RF first reflective surface
P1 Trigonal prism
P2 triangular prism
IS1 First imaging optical system solid-state imaging device
IS2 Second imaging optical system solid-state imaging device

JP, 2010-271675, A Japanese Patent No. 3290993 JP, 2014-56048, A

Claims (7)

An image pickup apparatus that takes an image by combining two image pickup optical systems each including an image pickup optical system having a total angle of view larger than 180 degrees and an image pickup device that converts an image formed by the image pickup optical system into an image signal. And
The two image pickup optical systems to be combined each include a first lens group arranged on the object side, a second lens group arranged on the image side of the first lens group, and a reflecting surface member. Have,
The reflecting surface member includes a first reflecting surface that bends the optical axis of the first lens group in a first direction, and an optical axis of a light beam reflected by the first reflecting surface, which is the light of the first lens group. An imaging device having an axis and a second reflecting surface that is bent in a second direction different from the first direction. The imaging device according to claim 1,
The two image pickup optical systems are
An imaging device in which the first directions are different from each other and the second directions are the same direction. The image pickup apparatus according to claim 2,
Reflecting surface member of each of the imaging optical system, a prism and a second reflecting surface and the first reflecting surface, said first direction is perpendicular to the optical axis of the first lens group, the second The image pickup device whose direction is orthogonal to the first direction. The imaging device according to claim 3,
The two imaging optical system, an imaging apparatus sharing the reflecting surface member. The image pickup device according to claim 2, 3, or 4,
Wherein the two imaging optical system, the imaging lens system for a small field of view having an optical axis substantially perpendicular to the same plane that contains the shared plane including the first direction and the optical axis of the first lens group and An imaging device having a small-field solid-state imaging device that captures an image by the imaging lens system via the shared plane as a small-field optical system. The imaging device according to claim 5,
The reflecting surface member, a prism having a first and second reflecting surfaces, the first direction is perpendicular to the optical axis of the first lens group, the second direction is the first Which is orthogonal to the direction, and the reflecting surface member is shared by the two imaging optical systems,
The first reflecting surface is formed as a bonding surface of the triangular prism,
The optical axis of the imaging lens system passes only one of the triangular prism, the imaging light beam by said imaging lens system, an imaging apparatus that does not intersect with the joint surface. The imaging device according to any one of claims 2 to 6,
Wherein the two imaging optical system or said two imaging optical system in the housing for accommodating the small-field optical system has at least five white LED as a lighting means,
Wherein three of the at least five LED, the first lens group of the other imaging optical system in the two said two imaging optical system and the first lens group of one of the imaging optical system in the imaging optical system Placed between and
The other two LED of the at least five LED are arranged on both sides of the position of the surface perpendicular direction of a plane including the optical axis of the second lens group of the two imaging optical systems,
An imaging device that illuminates the front and side with the at least five LEDs.

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