JP2000116602A - Retinal camera - Google Patents

Retinal camera

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Publication number
JP2000116602A
JP2000116602A JP10303277A JP30327798A JP2000116602A JP 2000116602 A JP2000116602 A JP 2000116602A JP 10303277 A JP10303277 A JP 10303277A JP 30327798 A JP30327798 A JP 30327798A JP 2000116602 A JP2000116602 A JP 2000116602A
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Japan
Prior art keywords
fundus
imaging
focusing
image
lens
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Pending
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JP10303277A
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Japanese (ja)
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Yoshi Kobayakawa
嘉 小早川
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Canon Inc
キヤノン株式会社
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Application filed by Canon Inc, キヤノン株式会社 filed Critical Canon Inc
Priority to JP10303277A priority Critical patent/JP2000116602A/en
Publication of JP2000116602A publication Critical patent/JP2000116602A/en
Application status is Pending legal-status Critical

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Abstract

PROBLEM TO BE SOLVED: To achieve an accurate adjustment of focus with a simple structure by projecting a target for focusing onto the eyegrounds and imaging a retinal reflection image to detect the blurring of a target image. SOLUTION: Reflected light from an eyground travels on an optical path 03 of an observation imaging system to form an image of a pupil P near a bored mirror 8 with an objective lens 15 and passes through a hole part of the bored mirror 8 and a turret 16 to form an image by an imaging lens 17 again near a field lens 18. Further, the light passes through a collimator lens 19 to form a retinal image onto an imaging means 21 for observation imaging with an imaging lens 20. The resulting image is displayed on a TV monitor 24 and an image signal is stored into a memory 23. Here, a general purpose camera 25 encircled by a dotted line detects the blurring of the image of the imaging means 21 by an automatically focusing function and moves a part of the imaging lens 20 in the direction of the optical path 03 to accomplish automatic focusing.

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明は、眼科病院等で使用する眼底カメラに関するものである。 BACKGROUND OF THE INVENTION The present invention relates to a fundus camera to be used in the ophthalmology hospital or the like.

【0002】 [0002]

【従来の技術】従来、眼底カメラにおいては合焦検出系と眼底撮影系がそれぞれ別個に設けられており、波長幅のある白熱ランプなどを使って合焦用光束を眼底に投影し、その眼底反射像の位置を合焦センサで検出している。 Conventionally, in a fundus camera has focus detection system and the ocular fundus photographing system is separately provided, respectively, by projecting the light beam for focusing the fundus with the incandescent lamp with a wavelength width, the fundus and it detects the position of the reflected image in the focus sensor. また、眼底照明系に設けた光分割部材を介して合焦用光束を眼底に投影し、光分割部材ごと合焦用光束投影系を動かして合焦する眼底カメラや、孔あきミラー付近に設けた小ミラーを介して合焦用光束を投影し、その合焦用光束投影系の一部と眼底撮影用合焦レンズを連動させて合焦する眼底カメラが知られている。 Further, through the light dividing member provided in the fundus illumination system projects the light beam for focusing the fundus, and the fundus camera to focus by moving the light beam projection system for focusing each of the light splitting member multiplexer, provided near the perforated mirror and through the small mirrors to project a light beam for focusing, a fundus camera has been known for focusing a portion in conjunction fundus photographing focusing lens focus of the focusing beam projection system. 更に、被検眼の瞳孔の一部から眼底に合焦視標を投影してその像位置を検知し、合焦用光束投影系を動かして合焦する眼底カメラや、孔あきミラー付近の視度補正レンズを手動で出し入れする眼底カメラも知られている。 Further, by projecting the focused target on the fundus from a portion of the subject's eye pupil detects the image position, and a fundus camera to focus by moving the light beam projection system for focusing, diopter near apertured mirror fundus camera and out of the correction lens in the manual are also known.

【0003】 [0003]

【発明が解決しようとする課題】しかしながら上述の従来例において、固定の合焦用光束投影系から光束を投影する装置では、ぼけた像位置で合焦しているために正確に合焦を行うことが難しいという問題があり、また合焦用光束投影系を動かして合焦する装置では、合焦レンズの駆動範囲の外側に瞳孔共役点があるために、合焦に伴う瞳孔共役位置の変動が大きく、可動部が大きくなり構成が複雑で操作が煩雑であるという問題点がある。 [SUMMARY OF THE INVENTION However in the conventional example described above, an apparatus for projecting a light beam from the light beam projecting system for focusing fixed, accurate focused to have focused on the blurred image position it has a problem that it is difficult, and in apparatus for focusing by moving the light beam projection system for focusing, to outside of the driving range of the focusing lens there is a pupil conjugate point, variations of the pupil conjugate position with the focus it is large, constituting the movable portion is increased there is a problem that complicated operations are complicated.

【0004】本発明の目的は、上述の問題点を解消し、 An object of the present invention is to solve the problems described above,
簡素な構成で高精度の合焦が可能な眼底カメラを提供することにある。 Accurate focusing with a simple configuration is to provide a fundus camera capable.

【0005】本発明の他の目的は、視度補正のための操作性を向上した眼底カメラを提供することにある。 Another object of the present invention is to provide a fundus camera with improved operability for diopter correction.

【0006】本発明の更に他の目的は、合焦に伴う瞳孔共役位置の変動を小さくして小径の結像レンズ及び汎用のデジタルカメラを使用可能とした眼底カメラを提供することにある。 [0006] Still another object of the present invention is to provide a fundus camera in which a variation in the pupil conjugate position with the focus to reduce the available small diameter of the imaging lens and a general-purpose digital camera.

【0007】本発明の更に他の目的は、眼底照明系の光束を制限することなく合焦用光束を眼底に投影する眼底カメラを提供することにある。 Still another object of the present invention is to provide a fundus camera to project the focusing beam without limiting the light flux of the fundus illumination system to the fundus.

【0008】 [0008]

【課題を解決するための手段】上記目的を達成するための本発明に係る眼底カメラは、眼底像を撮像手段により撮影する眼底撮影系と、眼底に合焦用視標を投影し眼底反射像を前記撮像手段により検出して合焦する合焦検出系とを有することを特徴とする。 Means for Solving the Problems] fundus camera according to the present invention for achieving the above object, the ocular fundus photographing system for photographing by the imaging means of the fundus image, the fundus reflection image by projecting the focus optotype the fundus the and having a focus detection system to focus is detected by the image pickup means.

【0009】また、本発明に係る眼底カメラは、対物レンズの瞳孔共役位置で眼底観察照明光路と眼底撮影光路を分割する眼底カメラにおいて、前記眼底観察照明光路に設けた固定の光分割部材と、該光分割部材を介して合焦用光束を合焦可能に眼底に投影する合焦用光束投影系と、眼底撮影系の合焦手段とを有し、前記合焦用光束投影系の合焦動作と眼底撮影系の合焦動作を連動することを特徴とする。 Further, the fundus camera according to the present invention is a fundus camera to divide the fundus observation illumination light path and the fundus photographing optical path at the pupil conjugate position of the objective lens, fixed a light dividing member provided in the fundus observation illumination light path, a focusing beam projection system for projecting a light beam for focusing the fundus to be focused through the light splitting member, and a focusing means ocular fundus photographing system, focusing beam projection system for focusing the alloy characterized by interlocking the focusing operation of the operation and the fundus photographing system.

【0010】本発明に係る眼底カメラは、前眼部に集光するレーザー光により眼底に視標を投影し、該視標の眼底反射像により合焦動作を行うことを特徴とする。 [0010] fundus camera according to the present invention, prior to project the target on the fundus with a laser beam focused on the eye, and performing a focusing operation by the fundus reflection image of the visual target.

【0011】本発明に係る眼底カメラは、合焦検出信号に基づいて被検眼共役位置に設けた視度補正レンズのパワーを変更することを特徴とする。 [0011] fundus camera according to the present invention is characterized by changing the power of the diopter compensation lens provided the eye conjugate position on the basis of the focus detection signal.

【0012】本発明に係る眼底カメラは、対物レンズによる眼底像を結像するレンズと、前記眼底像を撮像手段に結像する結像レンズ系とを有し、被検眼の瞳孔を前記結像レンズ系内に共役とし、前記結像レンズ系により合焦動作を行うことを特徴とする。 [0012] fundus camera according to the present invention includes a lens for imaging the fundus image by the objective lens, and an imaging lens system for imaging the fundus image to the imaging means, of the eye pupil of the imaging lens is coupled into the system, and performs a focusing operation by the imaging lens system.

【0013】本発明に係る眼底カメラは、眼底を一様に照明する眼底照明系を有し、該眼底照明系にレーザー光による合焦用光束の波長光を選択的に分割する光分割部材を設けたことを特徴とする。 [0013] fundus camera according to the present invention has a fundus illumination system that uniformly illuminates the fundus, a light splitting member for selectively dividing the wavelength of the light beam for focusing by laser light to the fundus illumination system characterized by providing.

【0014】 [0014]

【発明の実施の形態】本発明を図示の実施例に基づいて詳細に説明する。 It will be described in detail with reference to Detailed Description of the Invention The present invention in the examples illustrated. 図1は第1の実施例の眼底カメラの光学系の構成図を示す。 Figure 1 shows a block diagram of an optical system of the fundus camera of the first embodiment. 眼底観察撮影用の照明光学系の光路O1上には、観察用ランプ光源1、レンズ2、眼底照明光を透過する光分割部材3、フィールドレンズ4、撮影用ストロボ光源5、瞳孔Pに共役なリングスリット6、 On the optical path O1 of the illuminating optical system for fundus observation photographing, observation lamp light source 1, the lens 2, the light splitting member 3 that transmits fundus illumination light, a field lens 4, photographing strobe light source 5, conjugated to pupil P ring slit 6,
レンズ7、孔あきミラー8が順次に配列されている。 Lens 7, perforated mirror 8 are sequentially arranged. 光分割部材3の入射方向の合焦用光束投影光学系の光路O2 Optical path O2 of the light beam projecting optical system for focusing the incident direction of the light dividing member 3
上には、光分割部材3により選択的に反射される波長光を発する可視光ダイオードレーザー光源9、円柱レンズ10、紙面内でレーザー光源9の光束を平行にするレンズ11、図2に示すような瞳孔Pに共役なスリット12 The upper, visible light diode laser light source 9 that emits light with a wavelength which is selectively reflected by the light splitting member 3, the cylindrical lens 10, a lens 11 to collimate the light flux of the laser light source 9 in the paper, as shown in FIG. 2 conjugate slit 12 in such pupil P
aを有するスリット板12、レンズ13、図3に示すようにスリット12aに平行な3本の矩形状開口14aを有する正視眼底に共役な開口板14が順次に配列されている。 Slit plate 12 having a, a lens 13, the en-face fundus conjugate aperture plate 14 are successively arranged having three rectangular openings 14a parallel to the slits 12a as shown in FIG.

【0015】被検眼Eの前方の観察撮影光学系の光路O3 The optical path O3 in front of the observation imaging optical system of the eye E
上には、 被検眼E側から対物レンズ15、孔あきミラー8、瞳孔Pに共役な種々のパワーの視度補正レンズを有するターレット16、結像レンズ17、フィールドレンズ18、眼底光束を平行又は略平行にするコリメータレンズ19、結像レンズ20、観察撮像用の撮像手段21 The upper objective lens 15 from the eye E side, the perforated mirror 8, the turret 16 having a diopter correction lens conjugate various power pupil P, an imaging lens 17, a field lens 18, parallel fundus beam or a collimator lens 19 into a substantially parallel, an imaging lens 20, an imaging unit 21 for observation imaging
が順次に配列されている。 There has been sequentially arranged. 視度補正用のターレット16 Turret 16 for the diopter correction
にはノブ22が設けられ、このノブ22を指で回してターレット16を回転し、視度補正レンズを入れ換えることができるようになっている。 The knob 22 is provided to rotate the turret 16 by turning the knob 22 by a finger, thereby making it possible to switch the diopter compensation lens.

【0016】撮像手段21の出力はメモリ23、テレビモニタ24に接続されており、点線で囲まれた部分の結像レンズ20、撮像手段21、メモリ23、テレビモニタ24により汎用のデジタルカメラ25が構成されている。 The output memory 23 of the image pickup device 21 is connected to a television monitor 24, an imaging lens 20 surrounded by a dotted line, the imaging unit 21, a memory 23, a general-purpose digital camera 25 by the television monitor 24 is It is configured.

【0017】照明光路O1において、ランプ光源1からの光束はレンズ2により、光分割部材3、フィールドレンズ4、ストロボ光源5を介してリングスリット6に結像し、レンズ7を介して孔あきミラー8付近の瞳孔共役位置に再結像する。 [0017] In the illumination optical path O1, the light flux from the lamp light source 1 lens 2, the light splitting member 3, the field lens 4, via the flash light source 5 is imaged on the ring slit 6, apertured mirror through a lens 7 8 reimaging the pupil conjugate position in the vicinity. 合焦光路O2においては、レーザー光源9からの光束は、円柱レンズ10により紙面内で平行となった後で、レンズ11によりスリット板12に紙面垂直方向で集光し、レンズ13、開口板14、光分割部材3で反射され、観察光と同様の光路を通って被検眼Eの眼底に投影される。 In case Asehikariro O2, light beam from the laser light source 9 is, after becoming parallel with the paper surface by a cylindrical lens 10, in a direction perpendicular to the plane condensed into the slit plate 12 by a lens 11, a lens 13, an aperture plate 14 , is reflected by the light splitting member 3 is projected on the fundus of the eye E through the optical path similar to the observation light.

【0018】眼底からの反射光は観察撮影光路O3を進み、対物レンズ15により瞳孔Pを孔あきミラー8付近に結像し、孔あきミラー8の孔部、ターレット16を通り、結像レンズ17によりフィールドレンズ18付近に再結像する。 The light reflected from the fundus passes the observation photographic optical path O3, the pupil P is imaged in the vicinity of the perforated mirror 8 by the objective lens 15, passes through the hole, the turret 16 of the perforated mirror 8, an imaging lens 17 reimaging near the field lens 18 by. 更に、コリメータレンズ19を通って、結像レンズ20により観察撮像用の撮像手段21に眼底像を結像し、その映像はテレビモニタ24に表示され、その映像信号はメモリ23に記憶される。 Furthermore, through the collimator lens 19, focused fundus image on the imaging device 21 for observation imaging by the imaging lens 20, the image is displayed on the TV monitor 24, the video signal is stored in the memory 23. ここで、点線で囲まれた汎用のデジタルカメラ25は、自動合焦機能によって撮像手段21の映像のぼけを検出し、結像レンズ20の一部を光路O3方向に動かして自動合焦を行う。 Here, the general-purpose digital camera 25 surrounded by a dotted line, and detects the blur of the image of the imaging unit 21 by the automatic focusing function, performs automatic focusing by moving a part of the imaging lens 20 in the optical path O3 direction .

【0019】図4は瞳孔Pにおける光束の断面図を示し、瞳孔Pにはリングスリット像I、眼底観察光束O、 [0019] Figure 4 shows a cross-sectional view of a light flux at the pupil P, the pupil P ring slit image I, the fundus observation light beam O,
スリット板12のスリット12aを通ったスリット光束Fが集光しており、眼底にはテレビモニタ24に示すように、眼底像Rに重ねて開口板14のスリットに平行な開口14aを通った3本の光束Hが投影される。 Slit light bundle F passing through the slit 12a of the slit plate 12 is focused, the fundus passes through as shown in the television monitor 24, a slit parallel to the opening 14a of the aperture plate 14 overlapped with a fundus image R 3 book of the light beam H is projected. スリット12aは極めて細いので、被検眼Eの視度に拘らず眼底に投影された光束Hはスリット幅方向でぼけることはない。 Since the slits 12a is extremely thin, the light beam H projected on regardless fundus diopter of the eye E can not be blurred by the slit width direction. また、レーザー光源9を赤色波長にすればそれ程眩しくないので、輝度の強い光で眼底に鮮明な3本の光束Hを投影することができる。 Further, the laser light source 9 because not so bright if the red wavelength, it is possible to project the light beam H crisp three on the fundus with strong light intensity.

【0020】撮像手段21の映像からぼけを検出して自動合焦するときに、眼底像Rはそれ程コントラストが無く、また明るくない信号でもよく、鮮明な3本の光束H [0020] When automatic focusing by detecting a blur from an image of the imaging unit 21, the fundus image R is so no contrast, also may be less bright signal, clear three light beams H
を使ってスリット幅方向のぼけを検出し、容易に合焦することができる。 Detecting a blur of the slit width direction using, it can be easily focused. デジタルカメラ25の合焦調整範囲はあまり広くないので、被検眼Eの視度に応じて視度補正レンズを入れ換えることにより、眼底像Rを合焦するようにする。 Since the focusing adjustment range of the digital camera 25 is not so large, by replacing a diopter correction lens in accordance with the diopter of the subject's eye E, so as to focus the fundus image R. このとき、ターレット16は瞳孔共役位置にあるので、パワーを変えても結像レンズ20に投影される瞳孔共役位置は移動することはない。 At this time, turret 16 because the pupil conjugate position, the pupil conjugate position be changed power is projected onto the imaging lens 20 does not move.

【0021】また、撮像手段21からの合焦信号を使って視度補正レンズの交換を行ってもよい。 [0021] may be carried out to replace the diopter compensation lens with a focusing signal from the imaging means 21. 即ち、結像レンズ20の動きと合焦信号から、視度補正レンズをどの方向に変えたらよいかを演算し、その信号に基づきターレット16をステップモータで駆動して視度補正レンズのパワーをその方向に変更し、その状態で再度結像レンズ20を駆動して合焦を行う。 In other words, the movements and focusing signals of the imaging lens 20, calculates how can I change in any direction diopter correction lenses, the power of the diopter compensation lens by driving the turret 16 in the step motor based on the signal change in that direction, for focusing by driving the re-imaging lens 20 in that state. このようにして、被検眼Eの視度補正を自動化して操作性を向上することができる。 In this way, it is possible to improve the operability by automating diopter correction of the eye E.

【0022】瞳孔Pに集光するスリット光束Fを使用することにより、被検眼Eの視度に拘らず鮮明な合焦用視標を充分な照度で眼底に投影することができ、可動部が必要なくなって合焦投影光学系の構成を簡素化することができる。 [0022] By using a slit light flux F that condenses the pupil P, can be projected to the fundus of the sharp focusing optotype regardless diopter of the eye E with sufficient intensity, the movable portion it is possible to simplify the configuration of the focusing projection optical system no longer needed. また、撮像手段21を赤外光に感度を持つようにして、ランプ光源1を赤外LED光源、光源9をレーザー光源1と波長の異なる赤外ダイオードレーザー光源としてもよく、鮮明なスリット光束Fによる視標像のぼけから容易に合焦状態を検出することができる。 Further, the imaging unit 21 so as to have sensitivity to infrared light, infrared LED light source lamp light source 1, a light source 9 may be a laser light source 1 and the different infrared diode laser light source wavelengths, sharp slit light flux F it is possible to easily detect the focusing state from the blur of by optotype image.

【0023】また、スリット光束Fを縦方向だけではなく横方向にも設け、横方向の3本の矩形視標像も同時に投影し、両方向のぼけを使って2経線方向で平均的に合焦することができる。 Further, also provided in the lateral direction not only longitudinal slit light flux F, 3 present a rectangle optotype images of the lateral direction and simultaneously projected, average focused in two meridian directions with the directions of the blurring can do. また、スリット12aの代りに、 Further, instead of the slits 12a,
前眼部に点状に集光した光束により眼底に二次元的な視標を投影してもよい。 It may be projected a two-dimensional target onto the fundus by the light beam condensed into a spot shape on the anterior segment.

【0024】図5は第2の実施例の無散瞳眼底カメラの光学系の構成図を示す。 [0024] Figure 5 shows a configuration diagram of an optical system of the non-mydriasis fundus camera of the second embodiment. 眼底撮影照明光学系の光路O4上には、ストロボ光源30、リングスリット31、コリメータレンズ32、可視光を透過する光分割部材33、結像レンズ34、孔あきミラー35が順次に配列されている。 On the optical path O4 of the fundus photographing illumination optical system, strobe light source 30, a ring slit 31, a collimator lens 32, the light splitting member 33 which transmits visible light, an imaging lens 34, the perforated mirror 35 are sequentially arranged . 光分割部材33の入射方向の光路O5上には、合焦用の赤外LED光源36、視標マークMとなる開口部を有する開口板37、レンズ38、瞳孔Pに共役なリング開口を有する開口板39、赤外LED光源36の波長光を透過する光分割部材40、コリメータレンズ41が順次に配列され、光分割部材40の入射方向には、瞳孔Pに共役な眼底観察照明用の白熱ランプ光源42が配置されている。 On the optical path O5 incidence direction of the light splitting member 33 has an infrared LED light source 36 for focusing, an aperture plate 37 having an opening serving as a target mark M, a lens 38, a conjugated ring opening the pupil P aperture plate 39, the light splitting member 40 that transmits the wavelength of the infrared LED light source 36, the collimator lens 41 are sequentially arranged, the incident direction of the light splitting member 40, incandescent for conjugate fundus observation illumination pupil P lamp light source 42 is disposed.

【0025】被検眼Eの前方の眼底観察撮影系の光路O6 The optical path O6 forward of the fundus observation imaging system of the eye E
上には、被検眼E側から対物レンズ43、孔あきミラー35、合焦レンズ44、結像レンズ45、フィールドレンズ46、変倍リレーレンズ47、可視光と赤外光に感度を有する撮像手段48が順次に配列され、開口板37 The upper objective lens 43 from the eye E side, the apertured mirror 35, a focusing lens 44, an imaging lens 45, field lens 46, zoom relay lens 47, an imaging unit having sensitivity to visible light and infrared light 48 are sequentially arranged, the aperture plate 37
は撮像手段48の撮像面と共役に配置されている。 Is disposed on the imaging plane conjugate with the image pickup means 48. そして、撮像手段48の出力はテレビモニタ49に接続されている。 The output of the image pickup device 48 is connected to a television monitor 49.

【0026】照明光路O4において、ストロボ光源30の光束は、リングスリット31、コリメータレンズ32、 [0026] In the illumination optical path O4, the light flux of the strobe light source 30, a ring slit 31, a collimator lens 32,
光分割部材33、結像レンズ34を通り、孔あきミラー35で反射され、対物レンズ43から被検眼Eの眼底に投影される。 Light splitting member 33, passes through the imaging lens 34, is reflected by the perforated mirror 35, is projected from the objective lens 43 on the fundus of the eye E. また、光路O5上の赤外LED光源36の光束は、開口板37、レンズ38、瞳孔と共役な開口板3 Further, the light flux of the infrared LED light source 36 on the optical path O5 is aperture plate 37, a lens 38, a pupil conjugate with the aperture plate 3
9、光分割部材40、コリメータレンズ41を通り、光分割部材33で反射され、ストロボ光源30の撮影光と同様の光路を通って眼底に投影される。 9, the light splitting member 40, through the collimator lens 41, is reflected by the light splitting member 33, is projected to the fundus through the same optical path as that of the photographing light strobe light source 30. また、白熱ランプ光源42からの光束は、光分割部材40で反射され、 Further, the light beam from an incandescent lamp light source 42 is reflected by the light splitting member 40,
赤外LED光源36の合焦光と同様の光路を通って眼底を照明する。 Illuminating the fundus through the same optical path and focusing the light of the infrared LED light source 36.

【0027】眼底からの反射光は対物レンズ43、孔あきミラー35の孔部、合焦レンズ44を通り、結像レンズ45によりフィールドレンズ46上又はその付近に結像し、変倍リレーレンズ47を介して撮像手段48の撮像面に再結像する。 The light reflected from the fundus passes the objective lens 43, the hole of the holed mirror 35, passes through the focusing lens 44 forms an image on or near the field lens 46 by the imaging lens 45, zoom relay lens 47 reimaging on the imaging surface of the imaging unit 48 through. 撮像手段48では観察時には赤外光による眼底像Rが撮像され、撮影時には可視光による眼底像が撮像される。 At the time observation in the imaging unit 48 fundus image R is imaged by the infrared light, at the time of photographing the fundus image by visible light is imaged. 合焦は撮像手段48の映像信号により行い、図5に示すようにテレビモニタ49の映像をメモリに取り込み、視標像マークMのぼけが少なくなる方向に開口板37と合焦レンズ44を連動して駆動する。 Focusing is performed by the video signal from the imaging means 48 captures the memory image of the television monitor 49 as shown in FIG. 5, interlocking aperture plate 37 and the focusing lens 44 in the direction of blur of Mishirubezo mark M is reduced to to drive.

【0028】この合焦光学系においては、光分割部材3 [0028] In this focusing optical system, a light dividing member 3
3が固定なので、可動部が少なく機構を簡素化することができる。 Since 3 is fixed, it is possible to simplify the less mechanism moving parts. また、瞳孔Pにおいてリング状の光束から眼底視標像Mを投影しているので、焦点が外れると映像は直ぐにぼけ、これによって既存の汎用の技術を応用して自動合焦することができる。 Further, since the projecting fundus viewing Shirubezo M a ring-shaped light flux in the pupil P, the focus is out image blur immediately, which makes it possible to automatic focusing by applying the existing general-purpose technologies. なお、手動で合焦動作をする場合には、スプリットプリズムを使用する。 In the case of a manual focusing operation uses a split prism. また、開口板37を固定とし、開口板37と合焦レンズ38と撮影系の合焦レンズ44を連動するように構成してもよい。 Further, the aperture plate 37 is fixed and may be configured to work the focusing lens 44 and aperture plate 37 and the focusing lens 38 imaging system.

【0029】 [0029]

【発明の効果】以上説明したように本発明に係る眼底カメラは、眼底に合焦用視標を投影し、その眼底反射像を撮像手段で撮像し視標像のぼけを検出することにより、 Fundus camera according to the present invention as described in the foregoing projects the focus optotype the fundus, by detecting the blur of the target image imaged by the imaging means and the fundus reflection image,
精度良く合焦を行うことができ、眼底撮像系を合焦検出系と兼用できるので簡素な構成とすることができる。 Accurately focusing can be performed, since the fundus imaging system can also serve as focusing detection system can be simplified.

【0030】また、本発明に係る眼底カメラは、合焦用光束投影系の合焦動作と眼底撮像系の合焦動作を連動することにより、合焦用光束投影系の可動部を少なくすることができ、構成を簡素化することができる。 Further, the fundus camera according to the present invention, by interlocking the focusing operation and the focusing operation of the fundus imaging system of beam projection system for focusing, reducing the movable portion of the light beam projection system focus can be, it is possible to simplify the configuration.

【0031】本発明に係る眼底カメラは、前眼部に集光するレーザー光により眼底に視標を投影し、その反射像により合焦動作を行うことにより、合焦用光束投影系を固定して構成することができ、被検眼Eの視度に拘らず、ぼけのない眼底視標像により精度良く合焦することができる。 The fundus camera according to the present invention, prior to project the target on the fundus with a laser beam focused on the eye, by performing the focusing operation by the reflected image, to fix the light beam projecting system for focusing can be configured Te, irrespective of the diopter of the eye E, it is possible to accurately focus the fundus optotype image without blur.

【0032】本発明に係る眼底カメラは、合焦検出信号に基づいて視度補正レンズのパワーを変更することにより、視度補正の操作性を向上することができる。 The fundus camera according to the present invention, by changing the power of the diopter compensation lens based on the focus detection signal, it is possible to improve the operability of the diopter correction.

【0033】本発明に係る眼底カメラは、撮像手段の結像レンズ系内に瞳孔共役点を設けて、結像レンズ系により合焦するので、合焦動作に伴う瞳孔共役位置の変動を少なくすることができ、小径の結像レンズを使用して小型化、簡素化が可能となる。 The fundus camera according to the present invention, by providing a pupil conjugate point in the imaging lens system of the imaging means, since the focusing by the imaging lens system, to reduce the variation in the pupil conjugate position with the focus operation it can, miniaturization using small diameter of the imaging lens, it is possible to simplify.

【0034】本発明に係る眼底カメラは、眼底照明光学系にレーザー光による合焦用光束の波長光を選択的に分割する光分割部材を設けたことにより、この光分割部材を介して光量を殆ど減ずることなく、合焦用光束を眼底に投影することができる。 The fundus camera according to the present invention, by providing the light splitting member for selectively dividing the wavelength of the light beam for focusing by laser light to the fundus illumination optical system, the light amount through the light splitting member most without diminishing can project light fluxes for focusing the fundus.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】第1の実施例の構成図である。 1 is a configuration diagram of a first embodiment.

【図2】瞳孔共役絞りの正面図である。 2 is a front view of the aperture pupil conjugate.

【図3】眼底共役絞りの正面図である。 FIG. 3 is a front view of the fundus conjugate aperture.

【図4】瞳孔での光束断面の説明図である。 4 is an explanatory diagram of a light beam cross section at the pupil.

【図5】第2の実施例の構成図である。 5 is a block diagram of a second embodiment.

【符号の説明】 DESCRIPTION OF SYMBOLS

1、42 ランプ光源 3、33、40 光分割部材 5、30 ストロボ光源 6、31、39 リングスリット 8、35 孔あきミラー 9 レーザー光源 12 スリット板 14、37 開口板 16 ターレット 21、48 撮像手段 23 メモリ 24、49 テレビモニタ 36 赤外LED光源 1,42 lamp light source 3,33,40 light dividing member 5,30 strobe light source 6,31,39 ring slit 8,35 perforated mirror 9 the laser light source 12 a slit plate 14, 37 aperture plate 16 turret 21,48 imaging means 23 memory 24,49 TV monitor 36 infrared LED light source

Claims (7)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 眼底像を撮像手段により撮影する眼底撮影系と、眼底に合焦用視標を投影し眼底反射像を前記撮像手段により検出して合焦する合焦検出系とを有することを特徴とする眼底カメラ。 1. A have the ocular fundus photographing system for photographing by the imaging means of the fundus image, the focus detection system to focus detected by the image pickup means fundus reflection image by projecting the focus optotype the fundus fundus camera according to claim.
  2. 【請求項2】 眼底に合焦光束を投影し前記撮像手段によりぼけを検出して合焦する請求項1に記載の眼底カメラ。 2. A fundus projecting a focused beam fundus camera according to claim 1 which detects a blur focused by the imaging means.
  3. 【請求項3】 対物レンズの瞳孔共役位置で眼底観察照明光路と眼底撮影光路を分割する眼底カメラにおいて、 3. A fundus camera for dividing the fundus observation illumination light path and the fundus photographing optical path at the pupil conjugate position of the objective lens,
    前記眼底観察照明光路に設けた固定の光分割部材と、該光分割部材を介して合焦用光束を合焦可能に眼底に投影する合焦用光束投影系と、眼底撮影系の合焦手段とを有し、前記合焦用光束投影系の合焦動作と眼底撮影系の合焦動作を連動することを特徴とする眼底カメラ。 A fixed light splitting member provided on the fundus observation illumination light path, the light splitting and the focusing beam projection system for projecting a light beam for focusing to be focused on the fundus through the member, ocular fundus photographing system focusing means DOO has a fundus camera, which comprises interlocking the focusing operation and the fundus photographing system of the focusing operation of the light beam projection system for focusing the alloy.
  4. 【請求項4】 前眼部に集光するレーザー光により眼底に視標を投影し、該視標の眼底反射像により合焦動作を行うことを特徴とする眼底カメラ。 4. A projecting a target onto the fundus with a laser beam focused on the anterior segment, fundus camera and performs a focusing operation by the fundus reflection image of the visual target.
  5. 【請求項5】 合焦検出信号に基づいて被検眼共役位置に設けた視度補正レンズのパワーを変更することを特徴とする眼底カメラ。 5. A fundus camera and changing the power of the diopter compensation lens provided the eye conjugate position on the basis of the focus detection signal.
  6. 【請求項6】 対物レンズによる眼底像を結像するレンズと、前記眼底像を撮像手段に結像する結像レンズ系とを有し、被検眼の瞳孔を前記結像レンズ系内に共役とし、前記結像レンズ系により合焦動作を行うことを特徴とする眼底カメラ。 A lens for imaging the fundus image by 6. The objective lens, and an imaging lens system for imaging the fundus image to the imaging means, the conjugate of the eye pupil in the imaging lens system , a fundus camera and performs a focusing operation by the imaging lens system.
  7. 【請求項7】 眼底を一様に照明する眼底照明系を有し、該眼底照明系にレーザー光による合焦用光束の波長光を選択的に分割する光分割部材を設けたことを特徴とする眼底カメラ。 It has 7. A fundus illumination system that uniformly illuminates the fundus, and characterized by providing a light splitting member for selectively dividing the wavelength of the light beam for focusing by laser light to the fundus illumination system fundus camera.
JP10303277A 1998-10-09 1998-10-09 Retinal camera Pending JP2000116602A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002051986A (en) * 2000-08-10 2002-02-19 Kowa Co Fundus photographing system
JP2006247234A (en) * 2005-03-14 2006-09-21 Topcon Corp Ocular optical characteristic measuring instrument
WO2006106977A1 (en) * 2005-03-31 2006-10-12 Kabushiki Kaisha Topcon Ophthalmologic imager
WO2009018956A1 (en) * 2007-08-03 2009-02-12 Carl Zeiss Meditec Ag Device and method for the automatic focusing of a non-mydriatic fundus camera
JP2010233801A (en) * 2009-03-31 2010-10-21 Canon Inc Fundus camera
JP2010259647A (en) * 2009-05-08 2010-11-18 Canon Inc Fundus camera
JP2011015844A (en) * 2009-07-09 2011-01-27 Canon Inc Fundus camera
JP2011045550A (en) * 2009-08-27 2011-03-10 Canon Inc Fundus camera
JP2013215624A (en) * 2013-07-31 2013-10-24 Canon Inc Fundus camera
CN103957774A (en) * 2011-08-26 2014-07-30 爱尔康手术激光股份有限公司 Imaging-based guidance system for ophthalmic docking using a location-orientation analysis
JP2017100013A (en) * 2017-03-07 2017-06-08 株式会社ニデック Ocular fundus photographing apparatus

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002051986A (en) * 2000-08-10 2002-02-19 Kowa Co Fundus photographing system
JP2006247234A (en) * 2005-03-14 2006-09-21 Topcon Corp Ocular optical characteristic measuring instrument
JP4598570B2 (en) * 2005-03-14 2010-12-15 株式会社トプコン Ophthalmic optical characteristic measuring device
JP2006280477A (en) * 2005-03-31 2006-10-19 Topcon Corp Fundus camera
US7959288B2 (en) 2005-03-31 2011-06-14 Kabushiki Kaisha Topcon Ophthalmologic imager
WO2006106977A1 (en) * 2005-03-31 2006-10-12 Kabushiki Kaisha Topcon Ophthalmologic imager
WO2009018956A1 (en) * 2007-08-03 2009-02-12 Carl Zeiss Meditec Ag Device and method for the automatic focusing of a non-mydriatic fundus camera
JP2010233801A (en) * 2009-03-31 2010-10-21 Canon Inc Fundus camera
JP2010259647A (en) * 2009-05-08 2010-11-18 Canon Inc Fundus camera
JP2011015844A (en) * 2009-07-09 2011-01-27 Canon Inc Fundus camera
US8545019B2 (en) 2009-07-09 2013-10-01 Canon Kabushiki Kaisha Fundus camera
JP2011045550A (en) * 2009-08-27 2011-03-10 Canon Inc Fundus camera
CN103957774A (en) * 2011-08-26 2014-07-30 爱尔康手术激光股份有限公司 Imaging-based guidance system for ophthalmic docking using a location-orientation analysis
JP2013215624A (en) * 2013-07-31 2013-10-24 Canon Inc Fundus camera
JP2017100013A (en) * 2017-03-07 2017-06-08 株式会社ニデック Ocular fundus photographing apparatus

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