WO2016206002A1 - Catadioptric lens assembly and panoramic image acquisition device - Google Patents

Catadioptric lens assembly and panoramic image acquisition device Download PDF

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Publication number
WO2016206002A1
WO2016206002A1 PCT/CN2015/082125 CN2015082125W WO2016206002A1 WO 2016206002 A1 WO2016206002 A1 WO 2016206002A1 CN 2015082125 W CN2015082125 W CN 2015082125W WO 2016206002 A1 WO2016206002 A1 WO 2016206002A1
Authority
WO
WIPO (PCT)
Prior art keywords
surface
lens group
lens
photosensitive
catadioptric
Prior art date
Application number
PCT/CN2015/082125
Other languages
French (fr)
Chinese (zh)
Inventor
胡笑平
Original Assignee
博立多媒体控股有限公司
胡笑平
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 博立多媒体控股有限公司, 胡笑平 filed Critical 博立多媒体控股有限公司
Priority to PCT/CN2015/082125 priority Critical patent/WO2016206002A1/en
Publication of WO2016206002A1 publication Critical patent/WO2016206002A1/en

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/06Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B37/00Panoramic or wide-screen photography; Photographing extended surfaces, e.g. for surveying; Photographing internal surfaces, e.g. of pipe

Abstract

A catadioptric lens assembly (210) comprising one or two or more lens elements, having a first reflection surface (212), a second reflection surface (213) and at least one refraction surface (214, 215, 216) for converging incident light. The first reflection surface (212) is provided after all of the refraction surfaces (214, 215, 216) in a light incidence direction, and is not present in a region surrounding an optical axis (201). The second reflection surface (213) is opposite the first reflection surface (212) and is provided at the region surrounding the optical axis. Further provided is a panoramic image acquisition device comprising the catadioptric lens assembly (210) and a photosensitive module (220). The photosensitive module (220) can be installed facing a photographic field in the normal manner.

Description

Catadioptric lens group and a panoramic image acquisition apparatus

FIELD

The present invention relates to the field of imaging technology, particularly, to a catadioptric lens group and the appropriate panoramic image acquisition apparatus.

Background technique

Device will be able to capture images generally an annular region around 360 degrees is referred to as the panoramic image capturing apparatus. With the development of digital imaging technology, in particular, continue to improve the number of pixels and image processing capabilities, the use of the panoramic image capture devices is increasingly common.

At present panoramic imaging technology include the following:

1. ordinary image capturing device about the axis of rotation captured, and then perform the image to obtain a seamless panoramic image. This approach requires a lot of computing image stitching, it is difficult to ensure real-time and on the same location can not be continuous shooting, difficult to record motion video.

2. The sensing device mounted at the front end fisheye lens, with its super-wide-angle panoramic imaging is performed. Since the fisheye lens has a large distortion, it is difficult to obtain high-quality image restoration effect.

3. panoramic image acquisition using the mirror, as shown in FIG. 1, light rays from the imaging area AA after reflection mirror rotationally symmetric curved surface of BB and CC, DD into the photosensitive imaging module. This technique distortion is small, but requires discrete reflective element mounting accuracy difficult to control, and the smaller the amount of light actually entering the photosensitive module is difficult to obtain a clear image.

To provide better panoramic image capturing apparatus. Chinese invention patent application in the present invention No. CN201510183168.5, filed April 17, 2015, entitled "Panoramic image capturing apparatus" is proposed in the panoramic image capturing apparatus using a catadioptric lens group. One embodiment refer to Figure 2, catadioptric lens comprising a photosensitive group and the module, the group consisting of catadioptric lens L01 composed of three lens elements, the most distal from the light refracting surface S02 is incident, via the reflecting surface R03 into the photosensitive module; C04 sensing device comprises a sensing module and a second lens group L05, P06 line channel formed by drilling a photosensitive module in the lens embodiment. This new technology can reduce the size and improve the clarity of the image, but since the mounting direction of the photosensitive module mounted thereto in a conventional image capturing device orientation is in contrast to, i.e., facing away from the acquired images, so if for Handheld devices, users will bring trouble framing. And the lens in the bore will produce a gap on the captured image.

SUMMARY

To provide a catadioptric lens group including one or two or more lens elements, having a first reflecting surface, second reflecting surface and the refractive surface for condensing at least one incident light according to an aspect of the present invention. A first reflecting surface disposed in the direction of the incident light to the entire refractive surface for condensing incident light after and around the optical axis of the vacant region. The second reflective surface opposite to the first reflecting surface disposed in a region around the optical axis, such that the incident light through the first reflection surface after at least one lens element, the lens element and then through the at least one second after the reflection surface, and then emitted from the region around the optical axis after at least one lens element or voids.

Another aspect the present invention provides a panoramic image capturing apparatus includes the above catadioptric lens group and the sensing module, sensing module fixed or detachably connected to the catadioptric lens group basis. Photosensitive module comprises a sensing device for sensing light through catadioptric lens group converging.

Based on catadioptric lens group, and a panoramic image capturing apparatus according to the present invention, by way of combination of refraction and reflection twice to collect incident light to converge before once reflected a second time after the first converging reflection, and It may also be a third convergence (in this case, after the second reflection light path located in a plane not all voids), not only to increase exponentially converging effect, help clear image was obtained after the second reflection, also such apparatus more compact design, and the use of the two reflections, so that the scene may face the photosensitive module installed in a conventional manner, which avoids the difficulty of threading bore in the lens.

Conjunction with the drawings, a specific example of the present invention is described in detail in accordance with.

BRIEF DESCRIPTION

FIG 1 is a schematic view showing an optical path of the prior art panoramic image;

FIG 2 is a schematic view of a panoramic image capturing apparatus prior patent application;

FIG 3 is a diagram illustrating a panoramic image capturing apparatus according to embodiment 1 of the present invention;

FIG 4 is a diagram illustrating a panoramic image capturing apparatus according to embodiment 2 of the present invention;

FIG 5 is a schematic view of a panoramic image capturing apparatus according to Embodiment 3 according to the present invention.

detailed description

The present invention relates to a catadioptric lens group and a panoramic image acquisition apparatus, wherein a panoramic image capturing apparatus includes a catadioptric lens group and the sensing module. The following examples are panoramic image capturing apparatus as an example, in which the catadioptric lens group can be fixed or detachably connected with the sensing module. The use of a detachable connection, catadioptric lens may be set as a separate device. In this case, the panoramic image capturing apparatus according to the present invention may be a device having a dual function, when the installation of the catadioptric lens group can capture a panorama image, when the removal of catadioptric lens assembly module can serve as an ordinary photosensitive imaging collecting apparatus is used. In other words, by the conventional image capturing apparatus (such as a camera, video camera, cell phone cameras) installed catadioptric lens group to achieve a low cost panoramic image acquisition apparatus.

Example 1

According to one embodiment of the panoramic image capturing apparatus according to the present invention refer to Figure 3, comprises a catadioptric lens group 110 and the sensing module 120, the optical axis 101 thereof.

Examples catadioptric lens group has a simple structure, composed of one lens element 111, the lens element having a rear surface for converging the incident light and a refractive convex surface 114, called the back surface of the lens element and the light means (e.g., the present embodiment indicated by the arrow) incident on the other surface opposite to the surface.

The first reflection surface 112 is provided on the back surface of the lens element 111, for example, can be formed in the manner the back of the lens element of the reflective film coating. It is worth mentioning that, in the conventional apparatus to collect the panoramic dependent light reflection surface, the light condensing capability depends on the shape of the reflecting surface is curved, in the present invention, since the reflection surface and the refractive surface of the lens body of the binding, mainly rely on refractive surface to converge due to the presence of the reflective surface, the refractive surface of the lens so that the body can be repeatedly used, not only better and is easier to process the reflection surface of various shapes can be employed, such as flat, circular symmetrical convex or concave like.

A first reflecting surface around the optical axis in the region of vacancies, such that the final light emitted from here without interference. The central region of the hollow portion of the back surface of the lens element 111 in the embodiment of the present embodiment, thereby forming the vacant region of the first reflection surface area refers to the alleged center region around the optical axis. In other embodiments, the back surface flatness can be maintained using uncoated central region is held in a transparent manner to form a first reflection surface of the vacant region.

The second reflection surface 113 opposed to the first reflecting surface, disposed in the central region of the convex refractive surface, for example, coatings can be placed or formed in a mirror like manner. Wherein, the central region can be a first coating film and then flattened manner, direct coating manner may be used.

In other embodiments, the optical design and the required performance, catadioptric lens group may have varying structures, for example, may have two or more refractive surfaces. In the case of having a plurality of refractive surface, a first reflecting surface should be the direction of the incident light is provided on the entire surface for refracting the incident light after condensing. In the case of having a plurality of refractive surfaces, catadioptric lens group may consist of two or more lens elements, a first reflection surface provided on a back surface of the last lens element, a second reflecting surface disposed opposite thereto, after the second reflecting surface the optical path through the lens element may then, or may be completely hollow. Incident light through at least one lens element after a first reflection surface, and then through the second reflection surface element after the at least one lens, and then through at least a region around the optical axis of rear lens elements or emitted from voids, so that the light can be two or three times (once the incident, reflected once or twice) passes through the lens element to enhance the converging effect. Depending on the optical design of the lens and a transverse dimension, all light rays through the lens unit may be three, or may repeat only after a portion of the lens unit.

Photosensitive module 120 includes a light sensing device 121 and provided for fixing the circuit board and the PCB 122, sensing device 121 for sensing by the catadioptric lens group 110 converge. Preferably, in this embodiment the photosensitive module further comprises a second lens group 123, is provided prior to the photosensitive device, a second lens group after the light passes through the photosensitive sensor device. A second lens group arranged to increase an aspect can be further enhanced light-gathering power, it also expands the degree of freedom of optical design. In other embodiments, the photosensitive module may also have a simple structure, without using an additional lens group.

Embodiment, a portion of the photosensitive module, i.e., a second lens group of this embodiment, is accommodated in the rear surface portion of the lens element 111 in the hollow, to achieve a more compact arrangement. In other embodiments, sensing module may be integrally provided at the rear catadioptric lens group, not necessary to provide a recess for receiving the catadioptric lens in the lens group.

To provide a more abundant and excellent features, the present embodiment also includes additional elements listed below, in other embodiments, may comprise only one or several of them selectively according to application needs, it will not be repeated.

Mobile infrared filter 130, immobilized on a motor-driven rotary support 131, so as to be disposed between the movable lens group 110 off of the photosensitive device 121 reflecting the present embodiment, it is further provided a second lens group 123 and 121 between the sensing device. When it is desired to capture color images, for example, during the day or other externally visible illumination source case, the mobile IR filter may be moved into the optical path of the sensing device to filter out infrared light to obtain a better color. When need to take infrared photographs, external light is weak or at night for example, a mobile infrared filter is removed from the optical path of the sensing device, to improve the ability of the sensing device sensing infrared light.

Image processor (not shown), the panoramic image sensing device for collecting a round pie image is reduced to a cylindrical shape. For example, by coordinate conversion and interpolation calculation method, the photosensitive device captured image is reduced to a circular pie continuous cylindrical image.

A display screen (not shown), the photosensitive device for displaying a captured image, e.g., the photosensitive device display the acquired image or the original image (display may be segmented) image processor to restore the display. The required application scenarios, the normal display may be perpendicular to the optical sensing device, it may be parallel to the optical sensing device. Alternatively, the display may be provided separately from the image capturing means, only by data connections.

A storage unit (not shown) for storing images and other data collected by the photosensitive device.

The communication unit (not shown) for the image after the image processor, a wireless or wired manner to transmit, for example, to the receiving side specified by the user.

With this embodiment of the panoramic image acquisition apparatus, the photosensitive device may be conventional and the same as an ordinary camera, the face image acquired installation, except that the light from the image will pass through three stages after converging from catadioptric lens group emitted to the photosensitive module.

Example 2

According to the present invention panoramic image acquisition apparatus according to another embodiment with reference to FIG. 4 embodiment may include catadioptric lens group 210 and the sensing module 220, the optical axis 201 thereof.

The main difference between the embodiment 1 of the present embodiment is in that embodiment, catadioptric lens groups two lens elements 210 (i.e., the lens element in the front and rear lens elements) in the direction of the incident light is composed of sequentially disposed, a first reflector 212 provided on the back surface of the lens element after, so there are three refractive surface 214,215,216. The second reflection surface 213 is provided on the front surface of the front lens element (i.e. the refractive surface 214) of the central region, a second reflecting surface for convenience of the central zone may be flattened.

Photosensitive module 220 also includes a sensing device 221, PCB substrate 222 and the second lens group 223. In the present embodiment eliminates the movable IR filter.

Catadioptric lens group in the central region of the lens element after all of the hollow, the photosensitive sensing device module and second lens groups therein.

In this embodiment, since all the hollow central region of the lens element, the image light from the three passes through the front lens element, but only through the lens element twice.

In other embodiments, the front central region of the lens element may be fully hollow, in other words, each lens element catadioptric lens group in the optical axis region may be all around the hollow, which may facilitate optical design and processing. When the center region after all of the second reflecting surface thread empty, the incident light passes through the gap after the second reflection, rather than the lens body into the sensing module. In this case, an image can be corrected by providing the second lens group in the photosensitive module.

Example 3

According to the present invention panoramic image acquisition apparatus according to another embodiment may be 5, comprising a catadioptric lens group 310 and the photosensitive module 320, the optical axis 301 thereof.

This embodiment is similar to Example 1, catadioptric lens group consisting of one lens element composed of a first reflecting surface which is a back surface 312, which is positive for convex refractive surface 314, the second reflective surface 313 disposed at a central region of the convex refractive surface.

Photosensitive module 320 includes a photosensitive device 321, PCB substrate 322 and the second lens group 323. In this embodiment, the second lens group with autofocus lens assembly 3231 includes a stator 3232 and a mover, a lens group disposed on the mover. AF drive motor may be used, for example, polyhedral ultrasonic motor, a voice coil motor or the like. By using the auto-focus lens group can be further improved image quality.

In this embodiment, the back surface smooth catadioptric lens group, a recess is not provided, the first reflecting surface and uncoated in the central region remains transparent, photosensitive module integrally provided in the reflection off the rear lens group, so making easier.

Further, the present embodiment panoramic image acquisition apparatus further includes an LCD display 340 provided on the other surface of the PCB substrate, which is parallel to the normal to the optical axis of the photosensitive device, in order to show to the user the acquired images.

Specific examples of the above applications and embodiments of the principles of the present invention have been described, it should be understood that the above embodiments are merely to aid in understanding the invention and should not be construed as limiting the present invention. Those of ordinary skill in the art, according to the ideas of the present invention, changes may be made to the above specific embodiment.

Claims (8)

  1. One kind catadioptric lens group, characterized by comprising one or two or more lens elements, having a first reflecting surface, second reflecting surface and the refractive surface for condensing incident light of at least one,
    A first reflecting surface disposed in the direction of the incident light to the entire region around the optical axis and vacancies after condensing surface for refracting the incident light,
    The second reflective surface opposite to the first reflecting surface disposed in a region around the optical axis, such that the incident light through the first reflection surface after at least one lens element, the lens element and then through the at least one second after the reflection surface, and then emitted from the region around the optical axis after at least one lens element or voids.
  2. Said lens assembly as claimed in claim 1, characterized in that said catadioptric lens group composed of a lens element, the lens element having a convex refractive surface and a back surface, the back surface is a planar, convex or concave, the first a reflecting surface disposed on the back surface, second reflecting surface disposed within a central region of the convex refractive surface.
  3. Said lens assembly as claimed in claim 1, wherein said two lens elements off reflecting direction of light incident from the lens group disposed in order along the composition, a first reflecting surface disposed on the back surface of the lens element, of two reflection surfaces disposed in the central area of ​​the front surface of the front element of the lens.
  4. One kind of a panoramic image capturing apparatus, characterized by comprising,
    Catadioptric lens group having a structure as claimed in any of claims 1-3 claim;
    Photosensitive module, fixed or detachably connected with the catadioptric lens group, said photosensitive module comprises a sensing device for sensing the light reflected off by the converging lens group.
  5. The apparatus as claimed in claim 4, wherein said module further comprises a second photosensitive lens group, prior to the photosensitive device is disposed, after the light passes through a second lens group of said photosensitive sensing device.
  6. The apparatus as claimed in claim 5, wherein the second lens group autofocus lens group.
  7. Device according to any of claims 4-6, characterized in that said module is integrally provided on the photosensitive folding rear reflector lens group, or,
    The catadioptric lens group in the direction of the incident light, a central area of ​​the back surface of the last lens element at least partially hollow, the photosensitive housed in the hollow portion of the at least a portion of the module.
  8. The apparatus of any one of claims 4-7, characterized in that, further comprises one or more of the following elements:
    Display means for displaying the image captured photosensitive, normal or perpendicular to the display screen axis parallel to the photosensitive device;
    Image processor, for the reduction of the circle pie photosensitive device captured panorama image into a cylindrical shape;
    A storage unit for storing the captured image sensing device;
    A communication unit for an image after the image processor, a wired or wireless transmission manner;
    Mobile infrared filter, is movably disposed between said lens group and said photosensitive device catadioptric.
PCT/CN2015/082125 2015-06-23 2015-06-23 Catadioptric lens assembly and panoramic image acquisition device WO2016206002A1 (en)

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US20130057971A1 (en) * 2011-09-01 2013-03-07 Samsung Electronics Co., Ltd. Panoramic imaging lens and panoramic imaging system using the same
WO2013051744A1 (en) * 2011-10-07 2013-04-11 아이티아이 주식회사 Snychronous camera lens module for omnidirectional imaging using a single lens
CN103969800A (en) * 2014-03-26 2014-08-06 中国计量学院 Long-focus type panoramic annular imaging lens
CN204044421U (en) * 2014-03-26 2014-12-24 中国计量学院 Long-focus panoramic annular imaging lens

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995002841A1 (en) * 1993-07-16 1995-01-26 National Research Council Of Canada Panoramic lens
US6175454B1 (en) * 1999-01-13 2001-01-16 Behere Corporation Panoramic imaging arrangement
CN1421724A (en) * 2001-11-29 2003-06-04 株式会社立山研开 Holographic lens
WO2004042428A2 (en) * 2002-11-04 2004-05-21 O.D.F. Optronics Ltd. Omni-directional imaging and illumination assembly
US20040252384A1 (en) * 2003-06-12 2004-12-16 Wallerstein Edward P. Panoramic imaging system
CN1558262A (en) * 2004-01-12 2004-12-29 浙江大学 Annular panoramic gaze imaging method for large viewing field with 180 degree
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CN201041596Y (en) * 2007-04-24 2008-03-26 浙江大学 A multi-slice panoramic sweeping imaging lens
CN101038366A (en) * 2007-04-24 2007-09-19 浙江大学 Multi-sheet type panoramic looking-around imaging lens
CN101688969A (en) * 2007-07-09 2010-03-31 奥林巴斯株式会社 Optical element, optical system equipped with same and endoscope using same
CN102346358A (en) * 2010-07-29 2012-02-08 罗技欧洲公司 Optimized movable ir filter in cameras
US20130057971A1 (en) * 2011-09-01 2013-03-07 Samsung Electronics Co., Ltd. Panoramic imaging lens and panoramic imaging system using the same
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CN102495460A (en) * 2011-12-13 2012-06-13 复旦大学 Panoramic imaging lens
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CN204044421U (en) * 2014-03-26 2014-12-24 中国计量学院 Long-focus panoramic annular imaging lens

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