Source: https://patents.google.com/patent/JP2013105151A/en
Timestamp: 2020-02-20 11:10:00
Document Index: 573193106

Matched Legal Cases: ['art 13', 'art 27', 'art 60', 'art 13', 'art 11', 'art 11', 'art 11', 'art 13', 'art 13', 'art)\n13', 'art)\n14', 'arts 14', 'art)\n18', 'art 21', 'art 27', 'art)\n29', 'art)\n33']

JP2013105151A - Optical device - Google Patents
JP2013105151A
JP2013105151A JP2011250869A JP2011250869A JP2013105151A JP 2013105151 A JP2013105151 A JP 2013105151A JP 2011250869 A JP2011250869 A JP 2011250869A JP 2011250869 A JP2011250869 A JP 2011250869A JP 2013105151 A JP2013105151 A JP 2013105151A
JP2011250869A
Kazunori Yoshizaki
和徳 吉崎
2011-11-16 Application filed by Olympus Corp, オリンパス株式会社 filed Critical Olympus Corp
2011-11-16 Priority to JP2011250869A priority Critical patent/JP2013105151A/en
2013-05-30 Publication of JP2013105151A publication Critical patent/JP2013105151A/en
A lens adapter or a photographing lens used to construct a plenoptic camera is miniaturized.
An optical device 2 mounted on an imaging device main body 3 having an imaging element 25 includes an incident portion 17 for receiving light, a first mounting portion 13a for mounting the optical device 2 on the imaging device main body 3, A first lens group 15 that is two-dimensionally arranged on a plane perpendicular to the optical axis and emits light, and the first lens group 15 is opposite to the incident portion with respect to the first mounting portion 13a of the optical device. Located on the side.
The present invention relates to an optical device such as a lens adapter and a photographing lens.
Conventionally, a so-called plenoptic camera has been proposed. In a plenoptic camera, a microlens array is arranged in an optical system, and the focus position, focus depth, and viewpoint of an image can be changed after imaging. The plenoptic camera is also called a light field camera or a refocus camera (see Patent Document 1).
In Patent Document 1, a microlens array is arranged on a lens adapter that is interposed between a photographing lens and a camera body (camera body). For this reason, a plenoptic camera can be constructed by attaching a lens adapter to an existing camera body. Therefore, there is no need to physically modify the camera body.
JP 2010-102230 A
However, in Patent Document 1, the microlens array is located outside the camera body and is away from the image sensor. For this reason, the lens adapter has a relay lens that conjugates a predetermined position behind the microlens array with the light receiving surface of the image sensor in the camera body, and images the light from the microlens array via a relay lens. Send to element. Since the lens adapter includes a relay lens, there arises a problem that the size of the lens adapter increases.
An object of the present invention is to reduce the size of a lens adapter or a photographing lens used to configure a plenoptic camera.
An optical device according to an aspect of the present invention is an optical device attached to an image pickup device body having an image pickup device, and includes an incident portion for entering light, and a first for attaching the optical device to the image pickup device body. A mounting portion; and a first lens group that is two-dimensionally arranged on a plane perpendicular to the optical axis and emits light. The first lens group is located on a side opposite to the incident portion with respect to the first mounting portion of the optical device.
According to the present invention, in the lens adapter or the photographing lens, the relay lens is not necessary, and the lens adapter or the photographing lens can be reduced in size.
It is a schematic sectional drawing which shows the electronic camera which concerns on 1st embodiment. (A) It is a perspective view which shows the lens adapter which concerns on 1st embodiment. (B) It is an end view which shows the lens adapter which concerns on 1st embodiment. (A) It is a perspective view which shows the modification of the lens adapter which concerns on 1st embodiment. (B) It is an end view which shows the modification of the lens adapter which concerns on 1st embodiment. It is a figure explaining the distance of a micro lens array and an image sensor. It is a figure which shows an example of the optical system which comprises the plenoptic camera which concerns on 1st embodiment. It is a figure which shows the reconstruction method of the image on an image pick-up element, when the image surface is designated immediately above the micro lens array. It is a figure which shows the reconstruction method of the image on an image pick-up device, when an image surface is designated away from the micro lens array. It is a figure which shows the other example of the optical system which comprises the plenoptic camera which concerns on 1st embodiment. It is a schematic sectional drawing which shows the electronic camera which concerns on 2nd embodiment. (A) It is a perspective view which shows the lens adapter which concerns on 3rd embodiment. (B) It is an end view which shows the lens adapter which concerns on 3rd embodiment.
FIG. 1 is a schematic cross-sectional view showing an electronic camera 1 according to the first embodiment. 2A and 2B are a perspective view and an end view showing the lens adapter 2 according to the first embodiment, respectively. The electronic camera 1 is shown as an example of an imaging device that generates image data (electrical signals) from subject light, and the present embodiment can be applied to other imaging devices. In the present embodiment, the electronic camera 1 is shown as a still camera, but may be a video camera.
In FIG. 1, an electronic camera 1 is a mirrorless single-lens camera in which a taking lens can be exchanged. The electronic camera 1 includes a camera body (camera body) 3, a photographing lens 4, and a lens adapter 2. The lens adapter 2 is mounted between the camera body 3 and the photographing lens 4 and is connected to the camera body 3 and the photographing lens 4. The photographic lens 4 takes in light from the outside and condenses it into the camera body 3 through the lens adapter 2.
The lens adapter 2 (first optical device) includes a hollow cylindrical portion 11 having a cylindrical shape, an annular pedestal portion 13 that holds the cylindrical portion 11, and a microlens array 15 ( That is, a first lens group) is provided. The pedestal 13 of the lens adapter 2 is attached to the camera body 3 and the taking lens 4. The microlens array 15 is formed of a plurality of microlenses having the same shape formed on a substrate or the like and arranged in a plane in a direction perpendicular to the optical axis (or a direction perpendicular to the axis of the cylindrical portion 11). Here, the lens adapter 2 does not have a relay lens. For example, the lens adapter 2 may have a shape as shown in FIGS.
The cylindrical portion 11 of the lens adapter 2 has an opening 17 at one end, and the opening 17 corresponds to an incident portion where light enters from the outside of the lens adapter 2. The incident part of the lens adapter 2 may be an opening 19 on the photographic lens 4 side (opposite side of the microlens array 15) of the pedestal part 13. The cylindrical portion 11 has an attachment portion 18 to which the substrate of the microlens array 15 is attached at the other end, and the microlens array 15 is disposed at the other end. The attachment portion 18 holds the end of the substrate of the microlens array 15. The plurality of microlenses 16 of the microlens array 15 are regularly arranged two-dimensionally on a plane perpendicular to the axis of the cylindrical portion 11 (on a plane perpendicular to the optical axis).
The pedestal portion 13 of the lens adapter 2 includes a body-side mount portion 13a that is a mounting portion on the camera body 3 side, and a lens-side mount portion 13b that is a mounting portion on the photographing lens 4 side. A main body side mount portion 13a (first mounting portion) of the lens adapter 2 corresponds to a camera main body mount portion 27 (second mounting portion) that is a mounting portion of the camera main body 3, and is engaged and attached thereto. Due to the cylindrical portion 11, the microlens array 15 is positioned on the opposite side of the incident portion (opening portion 17 or 19) with respect to the main body side mount portion 13a of the lens adapter 2, and from the main body side mount portion 13a to the camera main body 3 side. It is arranged in the form that protrudes. The lens side mount portion 13b (third mounting portion) of the lens adapter 2 is engaged with and attached to the photographing lens mount portion 31 (fourth mounting portion) that is the mounting portion of the photographing lens 4.
The combination of the main body side mount portion 13a and the camera main body mount portion 27 and the combination of the lens side mount portion 13b and the photographing lens mount portion 31 constitute, for example, a bayonet mount. The shapes of the main body side mount portion 13a and the photographic lens mount portion 31 may be the same or different. When the main body side mount portion 13a and the photographing lens mount portion 31 have the same shape, the photographing lens 4 can be directly attached to the camera main body 3 when the lens adapter 2 is not used. In this case, the lens side mount portion 13b and the camera body mount portion 27 have the same shape.
The lens adapter 2 further includes a conductive portion 14 having conductivity in order to enable transmission and reception of electrical signals between a control unit 26 (described later) in the camera body 3 and the photographing lens 4. The conductive portion 14 has an electrical contact 14 a that contacts the electrical contact 28 of the camera body 3 and an electrical contact 14 b that contacts the electrical contact 35 of the photographing lens 4. As a result, it is possible to transmit and receive a lens driving signal to the lens driving mechanism of the photographic lens 4 and information of the photographic lens 4 between the control unit 26 of the camera body 3 and the photographic lens 4, and auto focus (AF: automatic focusing). ) Etc.
A camera main body 3 that is a main body of the camera (imaging device) includes a shutter unit 21, a filter 23, an image sensor 25, a control unit 26, and a liquid crystal monitor 29. The shutter unit 21 is open when the lens adapter 2 is attached to the camera body 3 unless a release switch (not shown) is operated. The filter 23 is a low-pass filter and / or an infrared (IR) filter. The image sensor 25 is composed of a CCD (Charge Coupled Device), a CMOS (Complementary Metal Oxide Semiconductor) or the like, and generates image data from pixel value data of each pixel. The control unit 26 performs various controls of the electronic camera 1. The control unit 26 may include a memory for storing data, a memory for storing an arithmetic program, and a CPU / DSP (central processing unit / digital signal processor) that executes the arithmetic program. The liquid crystal monitor 29 performs menu display and image display. The structure of the camera body 3 is an example. For example, the camera body 3 has a structure without a filter, a structure in which a shutter unit is omitted using a global shutter (electronic shutter) by an image sensor, and a single-lens reflex camera. It may be a structure with a ref.
When the lens adapter 2 is attached to the camera body 3, the microlens array 15 is positioned closer to the image sensor 25 than the camera body mount portion 27, which is a mounting portion of the camera body 3, in the camera body 3. Here, the microlens array 15 is installed over the shutter unit 21 when the lens adapter 2 is mounted so as to approach the image sensor 25. The microlens array 15 may be disposed closer to the camera body mount portion 27 than the shutter unit 21 without passing through the shutter unit 21.
When the lens adapter 2 attached to the photographic lens 4 is attached to the camera body 3, or when the photographic lens 4 is attached to the lens adapter 2 already attached to the camera body 3, the photographic lens 4 to the camera body A signal indicating that it is mounted on the third side via the conductive portion 14 is transmitted, and the control unit 26 of the camera body 3 can prohibit the use of the shutter unit 21. The photographer can also manually set the use prohibition of the shutter unit 21 by using the setting screen of the liquid crystal monitor 29 of the camera body 3. In the case of a camera body 3 (single-lens reflex camera) of a type having a reflex (mirror) inside, the control unit 26 invalidates the reflex and keeps it flipped up before the lens adapter 2 is attached. In that case, conventionally used phase difference AF is not used, and contrast AF by contrast detection via the image sensor 25 is used as in the case where there is no reflex (mirror).
As shown in FIG. 4, the distance X between the microlens array 15 and the image sensor 25 is preferably set to be equal to or longer than the focal length f of each microlens 16 constituting the microlens array 15 (X ≧ f). As a result, when the lens adapter 2 is inserted into the camera body 3 (at the time of mounting), the microlens array 15 and the image sensor 25 are too close to each other due to a blur in the insertion direction of the lens adapter 2. It is possible to prevent contact with each other. Specifically, the distance X is the distance between the exit surface of the microlens array 15 and the light receiving surface of the image sensor 25.
The photographing lens 4 (second optical device) has a lens group 33 (that is, a second lens group) composed of a plurality of lenses. The photographing lens 4 may be a single focal lens having a fixed focal length or a zoom lens having a variable focal length. Further, the photographing lens 4 has a lens driving mechanism that drives one or more lenses constituting the lens group 33, and the position of an imaging plane 41 (described later) can be adjusted by driving one or more lenses. is there. The optical axis of the lens group 33 is parallel to and substantially coincides with the axis of the cylindrical portion 11 of the lens adapter 2. The light beam emitted from the subject enters the lens group 33 of the photographing lens 4 as the main lens, passes through the microlens array 15, and is received by the image sensor 25.
<First example of optical system>
FIG. 5 shows an example of an optical system constituting the plenoptic camera according to the first embodiment. In FIG. 5, the distance X between the microlens array 15 and the image sensor 25 is the focal length f of the microlens 16 (X = f). Light rays emitted from the subject enter the lens group 33 of the photographing lens 4 as a main lens, and then form an image on the incident side surface of the microlens array 15. That is, the imaging surface 41 of the lens group 33 is adjusted by, for example, a lens driving mechanism so as to be positioned on the incident side surface of the microlens array 15. With this configuration, an image reflected on the light receiving surface of the image sensor 25 is an image obtained by decomposing light ray information for each certain area. By reconstructing an image obtained on the light receiving surface of the image sensor 25, an image on a desired image surface (an image at a desired focus position) can be obtained.
6 and 7 show a method for reconstructing an image on the image sensor 25. For the sake of brevity, only one dimension (one direction of the image) will be considered. 6 and 7 show the microlens 16, the light rays incident on the microlens 16, and the designated image plane.
In FIG. 6, the image plane is designated immediately above the microlens array 15. In this case, the five pixels “1”, “2”, “3”, “4”, and “5” of the image sensor 25 at positions corresponding to the respective microlenses “a”, “b”, “c”, “d”, and “e”. "Is arranged. For example, the information on the light ray at the image plane position (oblique line) corresponding to the microlens “c” on the image plane passes through the microlens “c” and the pixels “1”, “2”, “3” of the imaging element 25 in the back. “4” and “5” are reached. When the ray information at the image plane position corresponding to the microlens “c” is reconstructed, it can be expressed as L = c1 + c2 + c3 + c4 + c5. Here, “L” is the pixel value of the virtual pixel corresponding to the microlens “c” on the image plane, and the five pixels “1” “2” “3” “4” corresponding to the microlens “c”. Signal outputs from “5” are represented as “c1”, “c2”, “c3”, “c4”, and “c5”, respectively.
In FIG. 7, the image plane is specified at a position away from the microlens array 15 in the optical axis direction. For example, the information of the light ray at the image plane position (oblique line) corresponding to the microlens “c” on the image plane passes through the microlenses “a”, “b”, “c”, “d”, and “e”, and images of the back of the image The element 25 is reached. Reconstructing the ray information of the image plane position corresponding to the microlens “c” can be expressed as L = a1 + b2 + c3 + d4 + e5. Here, “L” is the pixel value of the virtual pixel corresponding to the microlens “c” on the image plane. The pixel “1” of the microlens “a”, the pixel “2” of the microlens “b”, Signal outputs from the pixel “3” of the lens “c”, the pixel “4” of the microlens “d”, and the pixel “5” of the microlens “e” are “a1”, “b2”, “c3”, It is expressed as “d4” and “e5”.
Thus, by adding the outputs of the pixels of the image sensor 25 (including weighted addition), an image at an arbitrary image plane position in the optical axis direction can be acquired. An image processing unit (not shown) of the camera body 3 performs arithmetic processing for adding the outputs of the pixels of the image sensor 25. By specifying an arbitrary image plane, arbitrary depth information of the subject (that is, images at different subject distances) can be acquired. If arbitrary depth information can be obtained in this way, then it is possible to obtain an omnifocal image that is in focus at all in-image positions and an image that has an arbitrary focus (focus) set after shooting. .
<Second example of optical system>
FIG. 8 shows another example of an optical system constituting the plenoptic camera according to the first embodiment. In FIG. 8, the distance X between the microlens array 15 and the image sensor 25 is larger than the focal length f of the microlens 16 (X> f). A light beam emitted from the subject enters the lens group 33 of the photographing lens 4 as a main lens and then forms an image in front of the microlens array 15. Thereafter, the light beam passes through the microlens array 15 and forms an image on the light receiving surface of the image sensor 25. As a result, as many partial images as the number of microlenses 16 are obtained on the light receiving surface of the image sensor 25 with parallax generated little by little. By integrating information of a plurality of partial images with parallax to obtain three-dimensional information of a subject, or reconstructing (combining) a plurality of partial images, a high-pixel whole image (high resolution image) can be obtained. .
In this case, in order to form an image on the light receiving surface of the image sensor 25, the distance X from the image sensor 25 to the microlens array 15 is a value satisfying the following lens imaging formula (1).
Here, a is the distance from the imaging surface 41 of the lens group 33 of the photographic lens 4 to the microlens array 15. In order to adjust the distance a so as to satisfy the expression (1), the position of the imaging surface 41 of the lens group 33 of the photographing lens 4 may be adjusted by, for example, the lens driving mechanism of the photographing lens 4.
Although X> f or X <f needs to be satisfied, the distance X is set so as to satisfy X> f in order to increase the distance X between the microlens array 15 and the imaging element 25.
According to this embodiment, the lens adapter 2 as an optical device includes an incident portion (for example, an opening portion 17 or 19) that receives light, and a first for attaching the lens adapter 2 to the imaging device main body (camera main body 3). A mounting portion (main body side mounting portion 13a) and a first lens group (microlens array 15) that is two-dimensionally arranged on a plane perpendicular to the optical axis and emits light. The first lens group is located on the side opposite to the incident portion with respect to the first mounting portion of the lens adapter 2. For this reason, when the lens adapter 2 is attached to the image pickup apparatus main body, the first lens group can be disposed close to the image pickup element 25 inside the image pickup apparatus main body. Therefore, a relay lens that relays light from the microlens array and sends it to the image sensor becomes unnecessary, and the lens adapter 2 can be downsized.
The imaging apparatus body includes a second mounting part (camera body mounting part 27) connected to the first mounting part of the lens adapter 2, and when the lens adapter 2 is mounted on the imaging apparatus body, the first lens group is It is located closer to the image pickup element 25 than the second mounting portion of the image pickup apparatus main body. For this reason, when the lens adapter 2 is attached to the imaging apparatus main body, the first lens group can be disposed closer to the imaging element 25 inside the imaging apparatus main body.
Since the distance between the imaging element 25 and the first lens group is equal to or greater than the focal length f of each lens (microlens 16) constituting the first lens group, the microlens array 15 and the imaging element 25 are too close to each other. , Can prevent unintentional contact.
The lens adapter 2 includes a third attachment portion (lens side mount portion 13b) for attaching the lens adapter 2 to another optical device (photographing lens 4) including a plurality of lenses arranged in the optical axis direction. For this reason, the optical system which comprises a plenoptic camera can be provided combining the lens adapter 2 provided with a 1st lens group, and such another optical apparatus.
FIG. 9 is a schematic sectional view showing the electronic camera 1 according to the second embodiment. In the second embodiment, unlike the first embodiment, the lens adapter is integrated with the photographic lens and provided as a part of the photographic lens 50. Accordingly, the photographing lens 50 (optical device) according to the second embodiment includes the microlens array 15. Instead of the lens adapter, the taking lens 50 includes a connection unit 60 for connecting to the camera body 3. In the connection part 60, unlike the first embodiment, the lens side mount part 13b and the electrical contact 14b do not exist. Other configurations are the same as those in the first embodiment.
The photographic lens 50 is attached to the camera body 3 by engaging the main body side mount 13a of the photographic lens 50 as an optical device with the camera body mount 27 of the camera body 3. The microlens array 15 (first lens group) is located on the opposite side of the first mounting portion (main body side mount portion 13a) of the photographing lens 50 from the incident portion 37 where light from the outside of the photographing lens 50 enters. . The taking lens 50 includes a lens group 33 (second lens group) composed of a plurality of lenses arranged in the optical axis direction, and the lens group 33 is disposed between the incident portion 37 and the microlens array 15. The light beam emitted from the subject passes through the incident portion 37, enters the lens group 33 as the main lens, passes through the microlens array 15 of the photographing lens 50, and is received by the imaging device 25 of the camera body 3. The
According to the second embodiment, the first lens group (microlens array 15) is located on the opposite side of the incident portion 37 with respect to the first mounting portion of the photographing lens 50. For this reason, when the photographic lens 50 is attached to the imaging apparatus main body (camera main body 3), the first lens group can be disposed close to the imaging element 25 inside the imaging apparatus main body. Therefore, a relay lens that relays the light from the microlens array 15 and sends it to the image sensor 25 becomes unnecessary, and the photographing lens 50 can be downsized.
In the third embodiment, the microlens array 15 is movable in the axial direction (or the optical axis direction) with respect to the main body side mount portion 13a. Other configurations are the same as those in the first embodiment.
FIGS. 10A and 10B are a perspective view and an end view showing a lens adapter 70 (optical device) according to the third embodiment, respectively. The lens adapter 70 includes a feeding mechanism 71 that can move the microlens array 15 in the axial direction (or the optical axis direction) during or after mounting to the camera body 3. In the lens adapter 70, the cylindrical portion 11 is slidable with respect to the pedestal portion 13 and thus the main body side mount portion 13a. The feeding mechanism 71 moves the microlens array 15 by sliding the cylindrical portion 11 with respect to the pedestal portion 13. FIG. 10A shows a state in which the cylindrical portion 11 is retracted with respect to the pedestal portion 13, and FIG. 10B shows a state in which the cylindrical portion 11 is extended with respect to the pedestal portion 13. If the pedestal portion 13 interferes with the mounting of the photographing lens 4, the photographing lens 4 may be attached after the cylindrical portion 11 is extended.
When the microlens array 15 is disposed so as to protrude from the main body side mount portion 13a to the inside of the camera body 3, when the lens adapter 70 is attached to the camera body 3, the components inside the camera body 3 and the lens adapter 70 may physically interfere. In order to prevent interference, the feeding mechanism 71 has a small protrusion Y to the inside of the camera body 3 of the microlens array 15 before the lens adapter 70 is mounted (FIG. 10A). Alternatively, the protrusion amount Y can be increased after mounting (FIG. 10B). The feeding mechanism 71 may be operated manually or by an actuator such as an electric motor.
10A and 10B, as an example of the feeding mechanism 71, a cam mechanism used for zoom lens feeding or the like is shown. The feeding mechanism 71 is a cam mechanism that includes a cam groove 72 provided in the cylindrical portion 11 and a cam follower (cam pin) that fits and slides in the cam groove 72. By moving the lever 73 in the circumferential direction with respect to the optical axis, the cam follower (cam pin) linked to the lever 73 moves in the circumferential direction, and the cylindrical portion 11 and the microlens array 15 attached to the cylindrical portion 11 are moved. Move in the direction of the optical axis.
In addition, you may provide the lock mechanism which moves the cylindrical part 11 to an axial direction manually, and locks the cylindrical part 11 when the cylindrical part 11 has extended without providing the feeding mechanism 71.
Further, the third embodiment may be applied to the photographing lens 50 of the second embodiment so that the microlens array 15 can be moved in the axial direction (or the optical axis direction) in the photographing lens 50.
According to the third embodiment, the microlens array 15 is movable in the axial direction (or the optical axis direction) with respect to the first mounting portion (main body side mount portion 13a). For this reason, the components inside the camera body 3 and the microlens array 15 are physically moved by moving the microlens array 15 gradually toward the image sensor 25 in the camera body when or after the lens adapter 70 is mounted. The possibility of interference is reduced. In addition, since the distance X between the microlens array 15 and the image sensor 25 can be adjusted, various optical systems constituting the plenoptic camera, such as the first and second examples of the optical system of the first embodiment. Can be adopted.
The present invention is not limited to the above-described embodiments, and it is apparent that various modifications can be made within the scope of the technical idea.
1 Electronic camera 2, 70 Lens adapter (first optical device)
3 Camera body (Imaging device body)
4 photographing lens 11 cylindrical part 13 pedestal part 13a body side mount part (first mounting part)
13b Lens side mount (third mounting part)
14 Conductive parts 14a, 14b, 28, 35 Electrical contacts 15 Micro lens array (first lens group)
16 Microlens 17, 19 Aperture (incident part)
18 Mounting part 21 Shutter unit 23 Filter 25 Image sensor 26 Control part 27 Camera body mounting part (second mounting part)
29 LCD monitor 31 Shooting lens mount (fourth mounting part)
33 Second Lens Group 37 Incident Portion 41 Imaging Surface 50 Shooting Lens 60 Connection Portion 71 Feeding Mechanism 72 Cam Groove 73 Lever
An optical device attached to an image pickup apparatus body having an image pickup element,
An incident part for incident light;
A first mounting portion for mounting the optical device to the imaging device body;
A first lens group that is arranged two-dimensionally on a plane perpendicular to the optical axis and emits light; and
The optical device, wherein the first lens group is located on the opposite side of the incident portion with respect to the first mounting portion of the optical device.
The imaging device main body includes a second mounting portion connected to the first mounting portion of the optical device,
The first lens group is positioned closer to the imaging element than the second mounting portion of the imaging device body when the optical device is attached to the imaging device body. The optical device described.
The optical apparatus according to claim 2, wherein a distance between the imaging element and the first lens group is equal to or greater than a focal length of each lens constituting the first lens group.
The second lens group including a plurality of lenses arranged in an optical axis direction, the second lens group being disposed between the incident portion and the first lens group. 4. The optical device according to any one of items 1 to 3.
The optical device according to any one of claims 1 to 3, further comprising a third mounting portion for mounting the optical device to another optical device including a plurality of lenses arranged in the optical axis direction. apparatus.
When the distance from the imaging plane by the plurality of lenses to the first lens group is represented by a and the focal length f of each lens constituting the first lens group, the first to the first lens group. The distance X to the lens group is given by
The optical device according to claim 3, wherein:
The optical device according to claim 1, wherein each lens constituting the first lens group is a microlens array.
The optical device according to claim 1, wherein the first lens group is movable with respect to the first mounting portion.
JP2011250869A 2011-11-16 2011-11-16 Optical device Pending JP2013105151A (en)
JP2011250869A JP2013105151A (en) 2011-11-16 2011-11-16 Optical device
JP2013105151A true JP2013105151A (en) 2013-05-30
ID=48624683
JP2011250869A Pending JP2013105151A (en) 2011-11-16 2011-11-16 Optical device
JP (1) JP2013105151A (en)
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