WO2014196388A1 - レンズ装置 - Google Patents
レンズ装置 Download PDFInfo
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- WO2014196388A1 WO2014196388A1 PCT/JP2014/063774 JP2014063774W WO2014196388A1 WO 2014196388 A1 WO2014196388 A1 WO 2014196388A1 JP 2014063774 W JP2014063774 W JP 2014063774W WO 2014196388 A1 WO2014196388 A1 WO 2014196388A1
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- WIPO (PCT)
- Prior art keywords
- optical system
- optical
- phase difference
- light
- prism
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
- H04N23/672—Focus control based on electronic image sensor signals based on the phase difference signals
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS 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
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
- G03B13/36—Autofocus systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/12—Beam splitting or combining systems operating by refraction only
- G02B27/123—The splitting element being a lens or a system of lenses, including arrays and surfaces with refractive power
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/16—Beam splitting or combining systems used as aids for focusing
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/282—Autofocusing of zoom lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/34—Systems for automatic generation of focusing signals using different areas in a pupil plane
- G02B7/343—Systems for automatic generation of focusing signals using different areas in a pupil plane using light beam separating prisms
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS 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
- G03B33/00—Colour photography, other than mere exposure or projection of a colour film
- G03B33/10—Simultaneous recording or projection
- G03B33/12—Simultaneous recording or projection using beam-splitting or beam-combining systems, e.g. dichroic mirrors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
- G02B7/38—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals measured at different points on the optical axis, e.g. focussing on two or more planes and comparing image data
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS 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
- G03B2217/00—Details of cameras or camera bodies; Accessories therefor
- G03B2217/002—Details of arrangement of components in or on camera body
Definitions
- This invention relates to a lens apparatus.
- the camera auto focus includes phase difference AF (auto focus), contrast AF, and the like.
- phase difference AF light entering from a lens is divided into two or three or more by pupil division and guided to a sensor for phase difference AF. Based on this, the in-focus direction and the amount of focus deviation are determined.
- Contrast AF is based on the image captured on the image sensor and moving the focus lens to look for a place where the contrast is high and focusing, and on the two image sensors located at different optical path lengths.
- optical path length difference AF optical path length difference AF
- the phase difference AF is divided into two by the pupil division and guided to the phase difference AF sensor by dividing the light from the lens, and based on the position deviation direction and the amount of deviation in the pupil division direction of each of the pupil divided images, Since the in-focus direction and the amount of focus shift are determined, the length of the optical system becomes long.
- the lens apparatus is configured so that the phase difference AF and the contrast AF can be used, the lens apparatus becomes large or difficult to handle unless the arrangement of the optical system is devised.
- Patent Document 1 it is not described how to arrange the optical system for AF in the lens device, and the above-mentioned problem is not considered.
- An object of the present invention is to prevent the lens device from becoming large.
- the lens apparatus includes a subject imaging optical system that forms a light bundle representing a subject light image on a light receiving surface of a subject imaging element, an incident light bundle having an optical axis parallel to the optical axis of the subject imaging optical system.
- a phase difference AF optical system including a phase difference imaging element in which a plurality of subject light images obtained by dividing the pupil into a plurality of parts by pupil division are formed on the light receiving surface, on the optical path of the light beam incident on the subject imaging optical system
- An optical path length difference AF optical system including a first image sensor and a second image sensor that are disposed at positions where the optical path lengths are different from each other, and a beam bundle guided to the subject imaging element by the subject imaging optical system
- a light branching optical system for guiding the optical system to a phase difference AF optical system and an optical path length difference AF optical system.
- the light beam representing the subject image is formed on the light receiving surface of the subject imaging element by the subject imaging optical system.
- the optical system for phase difference AF has an optical axis parallel to the optical axis of the subject imaging optical system, and the incident light bundle is divided into a plurality of parts by pupil division, thereby forming a plurality of subject light images on the light receiving surface.
- a phase difference image sensor is included.
- the optical system for optical path length difference AF includes a first image sensor and a second image sensor that are arranged at different positions on the optical path of the light beam incident on the subject imaging optical system. Yes. A part of the light beam guided to the subject imaging element is guided to the phase difference AF optical system and the optical path length difference AF optical system by the subject imaging optical system.
- the length of the phase difference AF optical system extends in the longitudinal direction of the lens apparatus. Even if the length of the phase difference optical system is long, it is possible to prevent the lens device from becoming large.
- the phase difference AF optical system is preferably disposed below the subject imaging optical system (vertically below the initial position (reference position) in which the lens apparatus is not tilted or rolled).
- the optical system for phase difference AF has a pupil division optical element that divides an incident light bundle into pupils, and the pupil division optical element is rotatable around the optical axis of the phase difference optical system.
- the optical branching optical system includes, for example, an optical branching device that vertically branches a part of the light beam guided to the subject imaging sensor by the subject imaging optical system, and the light beam branched by the optical branching device in front of the lens device.
- An optical path changer for branching (the object side of the lens device is forward and the image side is backward) is provided.
- the optical system for optical path length difference AF includes a three-way optical branching device that transmits a part of the light beam guided to the front of the lens device by the optical path changer and branches in two directions different from the front direction of the lens device. And two beam bundles branched in a direction different from the front of the lens device by the three-way deflector to the first image sensor and the second image sensor.
- the phase difference AF optical system has 3 The light beam that has passed through the directional deflector will be incident.
- the structure of a taking lens unit is shown. It is a front view of a three-way division prism. It is a top view of a 3 direction division
- the structure of a taking lens unit is shown.
- the structure of a taking lens unit is shown.
- the structure of a taking lens unit is shown.
- the structure of a taking lens unit is shown.
- FIG. 13 is a cross-sectional view taken along line XIII-XIII in FIG. It is a perspective view of the optical system for phase difference AF. It is a perspective view of the optical system for phase difference AF. A separator lens is shown. A separator lens is shown. A separator lens is shown. A separator lens is shown.
- FIG. 1 shows an embodiment of the present invention, and shows an optical configuration of a part of a photographing lens unit 1A and a camera body 80 used for broadcasting or the like.
- the taking lens unit 1A is detachably attached to the camera body 80.
- the taking lens unit 1A includes a focus lens (focus lens group) 2, a zoom lens (zoom lens group) 3, and a front relay so as to have an optical axis common to the optical axis O1 of the taking lens unit 1A.
- a lens (front relay / lens group) 5 and a rear relay / lens (rear relay / lens group) 7 are included.
- a diaphragm 4 is arranged between the zoom lens 3 and the front relay lens 5 so that the optical axis O1 of the photographing lens unit 1A passes through the center.
- a polarizing prism 6 is disposed between the front relay lens 5 and the rear relay lens 7.
- These focus lens 2, zoom lens 3, front relay lens 5, aperture 4, polarizing prism 6, and rear relay lens 7 include a light bundle representing a subject light image in the camera body 80. This is formed on the light receiving surfaces of one subject imaging CCD 85, second subject imaging CCD 86, and third subject imaging CCD 86 (subject imaging element), and is referred to as a subject imaging optical system.
- the camera body 80 is provided with a color separation prism 81 having a common optical axis with the optical axis O1 of the photographing lens unit 1A (subject imaging optical system) when the photographing lens unit 1A is attached.
- the color separation prism 81 includes a first prism 82, a second prism 83, and a third prism 84, and the incident light is separated into a red component, a green component, and a blue component.
- the subject imaging CCD 86 and the third subject imaging CCD 87 are respectively arranged.
- a part of the light (light component having a specific bias) reflected at the center of the polarizing prism 6 is applied to the taking lens unit 1A on the optical axis [AF (auto- Focusing optical axis] AF relay lens 10 (AF relay lens group) 10 is provided.
- AF auto- Focusing optical axis
- a total reflection mirror 11 is provided after the AF relay lens 10. Even if the polarizing prism 6 is not used, it is sufficient if the light can be branched.
- the total reflection mirror 11 totally reflects incident light forward (leftward in FIG. 1) where the subject exists.
- a total reflection direction of the total reflection mirror 11 is provided with a three-way split prism 12 (a three-way light splitter) that splits incident light into three directions.
- the three-way split prism 12 is composed of three prisms 13, 14 and 15.
- a first optical path length difference AF image sensor 21 (first image sensor) used for the optical path length difference AF is fixed on the upper side of the three-way split prism 12.
- a second optical path length difference AF image sensor 22 (second image sensor) used for the optical path length difference AF is fixed to the left (front) of the three-way split prism 12.
- the first optical path length difference AF image pickup element 21 and the second optical path length difference AF image pickup element 22 are arranged at positions where the optical path lengths are different from each other on the optical path of the light beam incident on the subject imaging optical system. It will be. Further, a phase difference AF optical system 30 extending in the vertical direction in FIG. 1 is fixed to the side surface of the three-way split prism 12.
- the light beam incident on the photographic lens unit 1A passes through the focus lens 2, the zoom lens 3, the diaphragm 4, the front relay lens 5, the polarizing prism 6 and the rear relay lens 7 and is guided to the camera body 80. It is burned.
- the light decomposing prism 81 included in the camera body 80 the light flux is decomposed into a red light component, a green light component, and a blue light component, respectively, and the first object image pickup CCD 85, the second object image pickup CCD 86, and the third object image pickup CCD.
- a subject image is formed in each of the subject imaging CCDs 87.
- Video signals representing subject images of the red light component, the green light component, and the blue light component are output from the first subject imaging CCD 85, the second subject imaging CCD 86, and the third subject imaging CCD 87, respectively. Become.
- the light beam incident on the photographing lens unit 1A is partially reflected by the polarizing prism 6.
- the light beam reflected by the polarizing prism 6 is guided to the total reflection mirror 11.
- the light beam incident on the total reflection mirror 11 is totally reflected and enters the three-way split prism 12.
- FIG. 2 is a front view of the three-way prism 12 (viewed from the front), and FIG. 3 is a plan view of the three-way prism 12.
- the three-way prism 12 includes a first prism 12, a second prism 13, and a third prism 14.
- the light beam incident on the three-way prism 12 is incident perpendicular to the first plane 13A of the first prism 12, and a part of the light is reflected on the second plane 13B.
- the reflected light beam is reflected on the first plane 13A, exits from the third plane 13C, and enters the first optical path length difference AF image sensor 21.
- the light beam transmitted through the second plane 13B of the first prism 12 is incident from the first plane 14A of the second prism 14, and a part of the light is reflected on the second plane 14B of the second prism 14.
- the light is emitted from the third flat surface 14 ⁇ / b> C that is the side surface of the second prism 13 and enters the phase difference AF optical system 30.
- the phase difference AF optical system 30 includes a cylindrical lens holding lens barrel 31 (pupil division optical element) and a phase difference imaging element unit 32 that holds a phase difference imaging element 33.
- the lens holding barrel 31 includes a separator lens (not shown) that forms an image on the light receiving surface of the phase difference imaging element 33 by dividing the incident light bundle into pupils.
- the light beam incident on the lens holding lens barrel 31 is divided into pupils by a separator lens and guided to the phase difference image sensor 33.
- Phase difference AF is performed based on the signal output from the phase difference image sensor 33.
- the light beam that has passed through the second prism 14 is emitted from the exit plane 15A of the third prism 14 and enters the second optical path length difference imaging device 22.
- the first optical path length difference imaging device 21 and the second optical path length difference imaging device 22 are optically equidistant from the light receiving surface of the subject imaging CCDs 85, 86, and 87 included in the camera body 80. It is positioned at a distance of. As a result, the optical path length difference AF is performed using the signals output from the first optical path length difference imaging device 21 and the second optical path length difference imaging device 22.
- the three-way decomposition prism 12 includes the first prism 13, the second prism 14, and the third prism 15 as described above. As described above, the light incident on the three-way resolving prism 12 in these prisms 13 to 15 is divided into three directions, and the first optical path length difference imaging device 21, the second optical path length difference imaging device 22, and The light enters the phase difference image sensor 33.
- the both sides of the three-way resolving prism 12 are made of ceramic or the like, and substantially trapezoidal prism holding frames 40 and 50 are fixed.
- One prism holding frame 40 has a hole 41 so that the second prism 14 is exposed.
- a convex portion 31A formed at the tip of the lens holding barrel 31 constituting the phase difference AF optical system 30 enters the hole 41.
- a wedge glass 61 is fixed to the front surface (left side) 42 of the prism holding frame 40, and a wedge glass 62 is fixed to the upper surface of the prism holding frame 40.
- a wedge glass 71 is fixed to the front surface 52 of the prism holding frame 50, and a wedge glass 72 is fixed to the upper surface of the prism holding frame 50.
- the first optical path length difference AF image sensor 21 is fixed to the wedge glasses 62 and 72 so that the light receiving surface faces the three-way resolving prism 12.
- the second optical path length difference AF image sensor 22 is fixed to the wedge glasses 61 and 71 so that the light receiving surface faces the three-way prism.
- FIG. 7 is a front view of the three-way resolution prism 12 to which the first optical path length difference AF image sensor 21 and the second optical path length difference AF image sensor 22 are fixed.
- the convex portion 31A formed at the tip of the lens holding barrel 31 constituting the phase difference AF optical system 30 enters the hole 41 formed in the prism holding frame 40.
- the light incident on the three-way resolving prism 12 is divided into three directions and is incident on the first optical path length difference imaging device 21, the second optical path length difference imaging device 22, and the phase difference imaging device 33. Will be.
- FIG. 8 corresponds to FIG. 1 and shows a part of the optical configuration of the taking lens unit 1B and the camera body 80.
- FIG. 8 the same components as those shown in FIG.
- the three-way prism 91 includes a first prism 92, a second prism 93, and a third prism 94.
- the three-way prism 91 can use the structure of a three-color separation prism that separates the incident light flux into three colors.
- the light beam enters from the first plane 92A of the first prism 92, and a part of the light beam is reflected on the second plane 92B of the first prism 92.
- the reflected light is reflected on the first plane 92A and emitted upward from the third plane 92C.
- a phase difference optical system 30 is disposed at a position opposite to the third plane 92C of the first prism 92.
- a part of the light incident on the three-divided prism 91 enters the phase difference imaging element 33 included in the phase difference imaging optical system 30.
- the light beam transmitted through the second plane 92B of the first prism 92 is incident on the second prism 93 from the first plane 93A, and a part of the incident light beam is reflected on the second plane 93B and the first plane 93A.
- the light is emitted downward from the third plane 93C.
- the first optical path length difference imaging device 21 is disposed at a position facing the third plane 93C of the second prism 93. Further, the light beam that has passed through the second plane 93B of the second prism 93 passes through the third prism 94 and enters the second optical path length difference image pickup device 22.
- the phase difference AF optical system 30 when the phase difference AF optical system 30 is arranged so that the light bundle emitted from above among the light bundles divided in the three directions by the three-direction splitting prism 91 is incident, the phase difference AF optical system is arranged. Since the length of the system 30 is long, the first optical path length difference imaging element 21, the second optical path length difference imaging element 22, the phase difference AF optical system 30, and the total reflection so as not to interfere with the subject imaging optical system. The mirror 40 and the three-way split prism 91 must be lowered. For this reason, the size of the imaging lens unit 1B is increased.
- FIG. 9 corresponds to FIG. 1 and FIG. 8, and shows a part of the optical configuration of the taking lens unit 1C and the camera body 80.
- FIG. 9 the same components as those shown in FIG. 1 or FIG.
- the light beam reflected by the total reflection mirror 11 enters the three-way split prism 91.
- the incident light bundle is divided into three directions, and enters the first prism 92, the second prism 93, and the third prism 94 as shown in FIG.
- the light bundle emitted upward from the first prism 92 enters the first optical path length difference imaging device 21.
- the light beam emitted downward from the second prism 93 enters the optical system 30 for phase difference AF.
- the light bundle emitted forward from the third prism 94 is incident on the second optical path length difference imaging device 22.
- the optical system 30 for phase difference AF Since the optical system 30 for phase difference AF is incident on the light beam emitted downward from the three-way split prism 91, it extends downward. For this reason, the size of the imaging lens unit 1C is increased.
- FIG. 10 corresponds to FIG. 1 and shows a part of the optical configuration of the taking lens unit 1D and the camera body 80.
- FIG. 10 the same components as those shown in FIG. 1, FIG. 8, or FIG.
- the light beam reflected forward enters the three-way split prism 91.
- the incident light bundle is divided into three directions, and enters the first prism 92, the second prism 93, and the third prism 94 as shown in FIG. 8 or FIG.
- the light bundle emitted upward from the first prism 92 enters the first optical path length difference imaging device 21.
- the light beam emitted downward from the second prism 93 is incident on the second optical path length difference image sensor 22.
- the light beam emitted forward from the third prism 94 enters the optical system 30 for phase difference AF.
- the optical axis of the phase difference AF optical system 30 is parallel to the optical axis O1 of the subject imaging optical system. For this reason, even if the phase difference AF optical system 30 is long, the imaging lens unit 1D can be prevented from being enlarged.
- the angle of the total reflection mirror 11 is positioned so that the light beam guided to the total reflection mirror 11 is reflected forward, but not the front but the total reflection mirror 11.
- the angle of the total reflection mirror 11 may be positioned so that the light flux guided to the back is reflected backward.
- the three-way split prism 91, the first optical path length difference imaging device 21, and the second optical path length difference imaging device are arranged behind the total reflection mirror 11 in the same positional relationship as shown in FIG. 22 and an optical system 30 for phase difference AF are arranged.
- the light beam reflected backward by the total reflection mirror 11 enters the three-way splitting prism 91, and in the same manner as described above, the first optical path length difference imaging device 21, the second optical path length difference imaging device 22, and The light enters the optical system 30 for phase difference AF. Even in such a case, the diameter of the imaging lens unit 1D can be reduced.
- a part of the light beam is deflected downward by the polarizing prism 6, but it may be upward rather than downward.
- the total reflection mirror 11, the three-way split prism 91, the first optical path length difference imaging device 21, the second optical path length difference imaging device 22, and the phase difference AF optical system 30 are used for subject imaging optics.
- the three-way split prism 91, the first optical path length difference imaging device 21, the second optical path length difference imaging device 22, and the phase difference AF optical system 30 are totally reflected.
- the front or rear of the mirror 40 may be used. Even when the phase difference AF optical system 30 is disposed above the subject imaging optical system, it goes without saying that the optical axis of the phase difference AF optical system 30 and the optical axis O1 of the subject imaging optical system are parallel to each other. Nor.
- the polarizing prism 6 and the AF relay lens 10 are held by a holding body 100.
- FIG. 11 and 12 are perspective views of the holding body 100.
- FIG. 11 and 12 are perspective views of the holding body 100.
- the holding body 100 has a substantially rectangular parallelepiped shape, and a hole 101 is formed at the center thereof.
- the polarizing prism 6 is positioned in the hole 10 so that the optical axis O1 of the subject imaging optical system passes through the center and a part of the light beam incident on the polarizing prism 6 is deflected vertically downward.
- a plate-like support 110 extending forward is fixed to the lower end of the holding body 100 on the right side when viewed from the front.
- a plate-like attachment member 111 that is bent inwardly perpendicular to the support 110 is fixed to the front surface of the support 110 (see FIG. 11).
- a hole 112 is formed in the center of the attachment member 111.
- the lens holding barrel 31 of the phase difference AF optical system 30 is inserted into the hole 112.
- the phase difference AF optical system 30 is attached to the attachment member 111 so that the surface on which the lens holding barrel 31 of the phase difference imaging element unit 32 is attached and the front surface of the attachment member 111 are in contact (see FIG. 12).
- FIG. 13 is a cross-sectional view taken along line XIII-XIII in FIG. In FIG. 13, the support 110 is not shown.
- the lens holding barrel 31 is fixed to the phase difference image sensor unit 32. As described above, the lens holding barrel 31 is inserted into the hole 112 of the attachment member 111.
- the attachment member 111 is formed with an insertion hole 113 that penetrates the hole 112 from above and an insertion hole 116 that penetrates the hole 112 from below.
- a screwing member 114 having a screw groove is formed in the vicinity of the hole 112 of the insertion port 113.
- a screw 115 is fitted in the screw groove of the screwing member 114.
- a screwing member 117 in which a thread groove is formed is formed near the hole 112 of the total opening 116.
- a screw 118 is fitted in the screw groove of the screwing member 117.
- the lens holding barrel 31 is fixed by the screws 115 and 118.
- the screws 115 and 118 are loosened, the screws 115 and 118 are retracted from the holes 112.
- the lens holding barrel 31 is loosened from being fixed by the screws 115 and 118, so that the lens holding barrel 31 is rotatable by a predetermined angle.
- FIG. 14 and 15 are perspective views of the phase difference imaging optical system 30 attached to the attachment member 111.
- FIG. 14 and 15 are perspective views of the phase difference imaging optical system 30 attached to the attachment member 111.
- the phase difference AF optical system 30 can be fixed to or removed from the mounting member 111 by adjusting the screws 115 and 118.
- the phase difference imaging optical system 30 can be attached to the attachment member 111 so that the phase difference imaging element unit 32 and the attachment member 111 are parallel, and as shown in FIG.
- the phase difference imaging optical system 30 can also be attached to the attachment member 111 so that the phase difference imaging element unit 32 and the attachment member 111 are in an oblique positional relationship.
- 16 and 17 show the inside of the lens holding barrel 31 as viewed from the rear side of the lens holding barrel 31 (left side in FIG. 13).
- FIG. 16 shows the state of the separator lenses 121 and 122 in the lens holding barrel 31 in the state shown in FIG. 14, and FIG. 17 shows the separator in the lens holding barrel 31 in the state shown in FIG. The state of the lenses 121 and 122 is shown.
- phase difference AF autofocusing is performed based on the positions of the two subject optical images divided by the separator lenses 121 and 122, so that the separator lenses 121 and 122 are the same as shown in FIG. If it is in the horizontal position, it is difficult to find the difference in the vertical position between the two subject light images. For this reason, accurate autofocus may not be possible.
- FIG. 17 when the separator lenses 121 and 122 are inclined, the two subject light images are displaced obliquely, so that the difference between the positions of the two subject light images is determined in the horizontal direction and the vertical direction. In any case, it is easy to find. Relatively accurate auto focus can be achieved.
- the transmittance of the polarizing prism 6 is 80% and the reflectance is 20%.
- the three-way split prism 12 or 91 is designed so that light is substantially equally incident on the first image sensor 21, the second image sensor 22 and the phase difference image sensor 33 for optical path length difference AF. .
- the separator lenses 121 to 124 in the lens holding barrel 31 may be arranged in two rows and two columns (a plurality in the horizontal and vertical directions). It will be understood that the arrangement of the separator lenses 121 to 124 makes it possible to detect the vertical and horizontal phase differences as described above.
- Imaging lens unit 21 First optical path length difference image sensor 22
- Second optical path length difference image sensor 30 Optical system for phase difference AF 33
- Phase difference image sensor 91 Three-way split prism
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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- Multimedia (AREA)
- Signal Processing (AREA)
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Abstract
Description
21 第1の光路長差撮像素子
22 第2の光路長差撮像素子
30 位相差AF用光学系
33 位相差撮像素子
91 3方向分割プリズム
Claims (4)
- 被写体光像を表わす光線束を被写体撮像用素子の受光面に結像させる被写体撮像光学系,
前記被写体撮像光学系の光軸と平行な光軸をもち,入射する光線束が瞳分割によって複数に分けられることにより得られる複数の被写体光像が受光面に結像される位相差撮像素子を含む位相差AF用光学系,
前記被写体撮像光学系に入射する光線束の光路上において光路長が互いに異なる位置に配置された第1の撮像素子と第2の撮像素子とを含む光路長差AF用光学系,ならびに
前記被写体撮像光学系によって前記被写体撮像用素子に導かれる光線束の一部を,前記位相差AF用光学系および前記光路長差AF用光学系に導く光分岐光学系,
を備えたレンズ装置。 - 前記位相差AF用光学系は,前記被写体撮像光学系の下側に配置されている請求項1に記載のレンズ装置。
- 前記位相差AF用光学系は,入射した光線束を瞳分割する瞳分割光学素子を有し,前記瞳分割光学素子は,前記位相差光学系の光軸を中心に回転自在である,
請求項1または2に記載のレンズ装置。 - 前記光分岐光学系は,
前記被写体撮像光学系によって前記被写体撮像用センサに導かれる光線束の一部を垂直方向に分岐させる光分岐器,および
前記光分岐器によって分岐させられた光線束をレンズ装置前方に分岐させる光路変更器を備え,
前記光路長差AF用光学系は,前記光路変更器によってレンズ装置前方に導かれた光線束の一部を透過させ,かつレンズ装置前方方向とは異なる2方向に分岐する3方向光分岐器を備え,かつ前記3方向偏向器によってレンズ装置前方と異なる方向に分岐させられた2つの光線束を前記第1の撮像素子および前記第2の撮像素子に導くものであり,
前記位相差AF用光学系は,前記3方向偏向器を透過した光線束を入射するものである,
請求項1から3のうち,いずれか一項に記載のレンズ装置。
Priority Applications (3)
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JP2015521390A JP5914760B2 (ja) | 2013-06-05 | 2014-05-26 | レンズ装置 |
CN201480032049.3A CN105264418B (zh) | 2013-06-05 | 2014-05-26 | 透镜装置 |
US14/959,906 US9554034B2 (en) | 2013-06-05 | 2015-12-04 | Lens device |
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JP2013-118494 | 2013-06-05 | ||
JP2013118494 | 2013-06-05 |
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US14/959,906 Continuation US9554034B2 (en) | 2013-06-05 | 2015-12-04 | Lens device |
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WO2014196388A1 true WO2014196388A1 (ja) | 2014-12-11 |
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PCT/JP2014/063774 WO2014196388A1 (ja) | 2013-06-05 | 2014-05-26 | レンズ装置 |
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US (1) | US9554034B2 (ja) |
JP (1) | JP5914760B2 (ja) |
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RU2726219C1 (ru) * | 2020-01-09 | 2020-07-10 | АКЦИОНЕРНОЕ ОБЩЕСТВО "Научно-исследовательский институт оптико-электронного приборостроения" (АО "НИИ ОЭП") | Способ наведения и фокусировки излучения на мишень и устройство для его осуществления |
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JP2004117491A (ja) * | 2002-09-24 | 2004-04-15 | Fuji Photo Optical Co Ltd | オートフォーカスシステム |
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JPH0743605A (ja) | 1993-08-02 | 1995-02-14 | Minolta Co Ltd | 自動焦点装置 |
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JP2002006208A (ja) * | 2000-06-23 | 2002-01-09 | Asahi Optical Co Ltd | 自動焦点検出機構を備えたデジタルスチルカメラ |
JP5045125B2 (ja) * | 2006-03-15 | 2012-10-10 | 株式会社ニコン | 被写体追尾装置および光学機器 |
JP5709532B2 (ja) * | 2011-01-05 | 2015-04-30 | キヤノン株式会社 | 自動合焦装置及びそれを有するレンズ装置及び撮像システム |
-
2014
- 2014-05-26 WO PCT/JP2014/063774 patent/WO2014196388A1/ja active Application Filing
- 2014-05-26 CN CN201480032049.3A patent/CN105264418B/zh not_active Expired - Fee Related
- 2014-05-26 JP JP2015521390A patent/JP5914760B2/ja not_active Expired - Fee Related
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2015
- 2015-12-04 US US14/959,906 patent/US9554034B2/en active Active
Patent Citations (6)
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JPS58211721A (ja) * | 1982-06-04 | 1983-12-09 | Olympus Optical Co Ltd | 合焦検出方法 |
JPS61295523A (ja) * | 1985-06-24 | 1986-12-26 | Minolta Camera Co Ltd | 焦点検出装置 |
JPH09274130A (ja) * | 1996-04-08 | 1997-10-21 | Nikon Corp | レンズ鏡筒及びカメラ |
JP2000266988A (ja) * | 1999-03-16 | 2000-09-29 | Olympus Optical Co Ltd | 電子カメラ |
JP2001264625A (ja) * | 2000-03-15 | 2001-09-26 | Minolta Co Ltd | 焦点検出装置 |
JP2004117491A (ja) * | 2002-09-24 | 2004-04-15 | Fuji Photo Optical Co Ltd | オートフォーカスシステム |
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US9554034B2 (en) | 2017-01-24 |
JPWO2014196388A1 (ja) | 2017-02-23 |
CN105264418A (zh) | 2016-01-20 |
US20160088217A1 (en) | 2016-03-24 |
CN105264418B (zh) | 2017-07-11 |
JP5914760B2 (ja) | 2016-05-11 |
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