JPH01212536A - Eye inspection device - Google Patents
Eye inspection deviceInfo
- Publication number
- JPH01212536A JPH01212536A JP63036997A JP3699788A JPH01212536A JP H01212536 A JPH01212536 A JP H01212536A JP 63036997 A JP63036997 A JP 63036997A JP 3699788 A JP3699788 A JP 3699788A JP H01212536 A JPH01212536 A JP H01212536A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- eye
- eyeground
- optical system
- section
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
- 238000007689 inspection Methods 0.000 title description 2
- 230000003287 optical effect Effects 0.000 claims abstract description 34
- 238000003384 imaging method Methods 0.000 claims abstract description 22
- 238000005286 illumination Methods 0.000 claims abstract description 10
- 210000004087 cornea Anatomy 0.000 abstract description 5
- 210000000887 face Anatomy 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002911 mydriatic effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 206010027646 Miosis Diseases 0.000 description 1
- 210000002294 anterior eye segment Anatomy 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000000295 emission spectrum Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003547 miosis Effects 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
Landscapes
- Eye Examination Apparatus (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野]
本発明は、例えば眼底カメラのように、アライメント用
の光学系と検査用の光学系とを併有する眼科検査器械に
関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an ophthalmological examination instrument, such as a fundus camera, which has both an optical system for alignment and an optical system for examination.
[従来の技術]
従来、この種の眼科検査器械としては、例えば特公昭6
1−90号公報に開示されているもの等が知られている
。第5図、第6図はこの従来例におけるアライメント時
と検査時の2つの態様を示したものである。即ち、アラ
イメントのために被検眼Eの前眼部を観察するには、第
5図に示すように観察光軸上に補助レンズ1を挿入する
と共に、眼底観察光源2からの光を遮光板3によって遮
光し、専ら前眼部照明ランプ4からの光によって前眼部
を照明するようにしている。[Prior Art] Conventionally, as this type of ophthalmological examination instrument, for example, the
The one disclosed in Japanese Patent No. 1-90 is known. FIGS. 5 and 6 show two aspects of this conventional example, one at the time of alignment and the other at the time of inspection. That is, in order to observe the anterior segment of the eye E to be examined for alignment, the auxiliary lens 1 is inserted on the observation optical axis as shown in FIG. The anterior segment of the eye is illuminated exclusively by light from the anterior segment illumination lamp 4.
また、被検眼Eの眼底Efを観察するときには、第6図
に示すように前述の補助レンズlを観察光軸上から退避
させると共に、遮光板3も照明光路から退避し、前眼部
照明ランプ4からの光が前眼部に入射しないようにして
、専ら眼底観察光源2からの光で眼底Efを照明するよ
うにしている。なお、第5図、第6図において、5は眼
底写真撮影用光源、6は対物レンズ、7は有孔ミラー、
8は合焦レンズ、9は赤外テレビカメラ、10は感光フ
ィルム、11.12は赤外フィルタを示している。When observing the fundus Ef of the eye E, the auxiliary lens l mentioned above is retracted from the observation optical axis as shown in FIG. The fundus Ef is illuminated exclusively with light from the fundus observation light source 2, while the light from the fundus observation light source 2 is prevented from entering the anterior segment of the eye. In addition, in FIGS. 5 and 6, 5 is a light source for photographing the fundus, 6 is an objective lens, 7 is a perforated mirror,
8 is a focusing lens, 9 is an infrared television camera, 10 is a photosensitive film, and 11.12 is an infrared filter.
[発明が解決しようとする問題点]
しかしながら、従来例において観察部位を切換える場合
に、少なくとも補助レンズ1を観察光軸上に出しλれす
る必要があるため、次のような欠点が生ずる。[Problems to be Solved by the Invention] However, in the conventional example, when switching the observation region, it is necessary to bring out at least the auxiliary lens 1 on the observation optical axis and move it by λ, resulting in the following drawbacks.
(1)補助レンズ1を出し入れするための案内機構、操
作部又は駆動手段が必要である。(1) A guide mechanism, an operating section, or a driving means for taking the auxiliary lens 1 in and out is required.
(2)補助レンズ1の位置を検知するスイッチが必要で
ある。(2) A switch is required to detect the position of the auxiliary lens 1.
(3)切換操作のため、手動の場合はアライメント状態
がずれたり、電動駆動の場合は作動音が発生したりする
。(3) Due to the switching operation, the alignment state may shift when using manual drive, and operation noise may occur when using electric drive.
(0観察光軸上での補助レンズlの位置調整が複雑微妙
で難しい。(Adjusting the position of the auxiliary lens l on the zero observation optical axis is complicated and difficult.
[発明の目的]
本発明の目的は、上述の従来例の欠点を改善するため、
複数の観察部位に対応できる複数焦点光学系と照明手段
とを用いて、光軸方向に位置の異なる複数個所を切換え
て観察できるようにした眼科検査器械を提供することに
ある。[Object of the invention] The object of the present invention is to improve the drawbacks of the above-mentioned conventional example,
An object of the present invention is to provide an ophthalmologic examination instrument that can switch and observe a plurality of locations at different positions in the optical axis direction by using a multifocal optical system and illumination means that can accommodate a plurality of observation locations.
[発明の概要]
上述の目的を達成するための本発明の要旨は、異なる一
離にある複数の物体面を同一結像面に同一時に結像する
複数焦点光学系と、前記複数の物体面を選択して照明す
る照明手段とを備えた。ことを特徴とする眼科検査器械
である。[Summary of the Invention] The gist of the present invention for achieving the above-mentioned object is to provide a multifocal optical system that simultaneously images a plurality of object planes located at different distances on the same imaging plane, and and illumination means for selectively illuminating. This is an ophthalmological examination instrument characterized by the following.
[発明の実施例]
本発明を第1図〜第4図に図示の実施例に基づいて詳−
に説明する。[Embodiments of the Invention] The present invention will be described in detail based on the embodiments illustrated in FIGS. 1 to 4.
Explain.
第1図は本発明を無散瞳眼底カメラに適用した一実施例
を示すものである。第17において、11は観察用光源
であり、この光路に沿って赤外フィルタ12、コンデン
サレンズ131.写真撮影用光源14、コンデンサレン
ズ15、円環状開口を有するリングスリット板16、リ
レーレンズ17、有孔ミラー18が順次に配置され、有
孔ミラー18と被検眼Eとの間に対物レンズ19が配置
されている。このうちの観察用光源11、撮影用光源1
4、リングスリット板16、有孔ミラー18及び角膜E
cは、それぞれコンデンサレンズ13、コンデンサレン
ズ15、リレーレンズ17及び対物レンズ19により略
共役とされている。FIG. 1 shows an embodiment in which the present invention is applied to a non-mydriatic fundus camera. In No. 17, 11 is a light source for observation, and along this optical path there is an infrared filter 12, a condenser lens 131, . A photography light source 14, a condenser lens 15, a ring slit plate 16 having an annular aperture, a relay lens 17, and a perforated mirror 18 are arranged in sequence, and an objective lens 19 is placed between the perforated mirror 18 and the eye E to be examined. It is located. Of these, observation light source 11, photography light source 1
4, ring slit plate 16, perforated mirror 18 and cornea E
c is substantially conjugate with the condenser lens 13, condenser lens 15, relay lens 17, and objective lens 19, respectively.
また、赤外フィルタ12は第3図の曲線Aで示すように
、観察用光源11の発光スペクトルにより被検眼Eの縮
瞳を生じさせるような可視光は透過せず、後述の観察用
赤外テレビカメラの第3図に示す曲線Bの感度波長域の
赤外光の、うち比較的短波長側の光を透過させる特性を
有している。有孔、ミラー18のミラ一部は、赤外フィ
ルタ12の透過光及びこれよりも更に短波長側の可視光
を反射し、・後述する赤外フィルタ31の波長領域光を
透過する特性を有している。Furthermore, as shown by curve A in FIG. 3, the infrared filter 12 does not transmit visible light that would cause miosis of the subject's eye E due to the emission spectrum of the observation light source 11, The television camera has a characteristic of transmitting relatively shorter wavelengths of infrared light in the sensitivity wavelength range of curve B shown in FIG. 3. A portion of the perforated mirror 18 has the characteristics of reflecting the light transmitted by the infrared filter 12 and visible light with shorter wavelengths, and transmitting light in the wavelength range of the infrared filter 31, which will be described later. are doing.
有孔ミラー18の前後には、光軸方向に移動可能な1合
焦レンズ20、複数の焦点距離を宥する複数焦点光学系
の一例として二重焦点フレネルレンズ21.観察□光路
と撮影光路とを切換える可動ミラー22.撮影時に光路
を開くシャッタ23、写真撮影用のフィルム24が順次
に配置されている。なお、二重焦点フレネルレンズ21
は第2図に拡大して示すように、例えば小帯域の円環状
をなす長焦点結像部21aと短焦点結像部21bとを有
している。In front and behind the perforated mirror 18, there are a single focusing lens 20 movable in the optical axis direction, and a bifocal Fresnel lens 21 as an example of a multifocal optical system that accommodates a plurality of focal lengths. Observation □ Movable mirror 22 that switches between the optical path and the photographing optical path. A shutter 23 that opens an optical path during photographing and a photographic film 24 are arranged in this order. In addition, the bifocal Fresnel lens 21
As shown in an enlarged view in FIG. 2, it has a long focal length imaging section 21a and a short focal length imaging section 21b, each having a small band annular shape, for example.
また、可動ミラー22の反射側には、可動ミラー22に
関してフィルム24と略共憚、な位置に配置されたコン
デンサレンズ25、轡像レンズ26、赤外光領域、に感
度を有し撮像面がフィルム24と略共役に置かれた赤外
チンピ27が一次に配置されており、この赤外テレビカ
メラ27による赤外光撮像信号をケーブル28によりモ
ニタテレビ29に送って、可視化表示手段であるブラウ
ン管面29aに映出するようになっている。なお、eは
これ、を観察する検者眼を表している。Further, on the reflection side of the movable mirror 22, there is a condenser lens 25 and an imaging lens 26, which are disposed at a position substantially co-located with the film 24 with respect to the movable mirror 22, and are sensitive to the infrared light region and have an imaging surface. An infrared camera 27 is placed approximately conjugate to the film 24, and the infrared light imaging signal from the infrared television camera 27 is sent to a monitor television 29 via a cable 28 to be displayed on a cathode ray tube as visualization display means. It is designed to be projected on the surface 29a. Note that e represents the examiner's eye for observing this.
また、被検眼Eの斜め前方には被検眼の前眼部を所要時
に照明するための前眼部照明ランプ30、第3図のBに
示すよ、うに赤外テレビ感度領域と重なるが、赤外フィ
ルタ12よりも長波長域の波長Cを透過する赤外フィル
タ31.前眼部を入射する外光りを遮光するための遮光
手段32が配置されている。In addition, diagonally in front of the subject's eye E, there is an anterior segment illumination lamp 30 for illuminating the anterior segment of the subject's eye when necessary, which overlaps with the infrared television sensitivity area as shown in FIG. 3B. An infrared filter 31 that transmits wavelength C in a longer wavelength range than the outer filter 12. A light blocking means 32 is arranged to block external light entering the anterior segment of the eye.
第1図において、Pl及びP2はそれぞれ眼底Ef及び
角膜Ecの対物レンズ19による結像位置を示し、眼底
EfはP11合焦レンズ20、二重焦点フレネルレンズ
21の長焦点結像部21aに関してフィルム24と略共
役とされている。In FIG. 1, Pl and P2 indicate the imaging positions of the fundus Ef and the cornea Ec by the objective lens 19, respectively, and the fundus Ef is a film with respect to the long focus imaging section 21a of the P11 focusing lens 20 and the bifocal Fresnel lens 21. It is said to be approximately conjugate with 24.
次に1本実施例の操作を説明すると、被検眼Eと眼底カ
メラ本体の光学系を適正な関係にするためのアライメン
ト時には、可動ミラー22を実線で示す位置において前
眼部照明ランプ30を点灯すれば、被検眼Eの角膜Ec
の近傍の前眼部が赤外フィルタ31を透過した赤外光に
よって照明され、対物レンズ19、有孔ミラー18の中
央孔及びミラ一部、合焦レンズ20、二重焦点フレネル
レンズ21の短焦点結像部21b、可動ミラー22、コ
ンデンサレンズ25.撮像レンズ26を経て赤外テレビ
カメラ27で撮影され、前眼部がモニタテレビ29に映
出される。検者はこの映像を観察しながら眼底カメラを
操作することができる。Next, to explain the operation of this embodiment, during alignment to establish a proper relationship between the optical system of the eye E and the fundus camera body, the anterior segment illumination lamp 30 is turned on with the movable mirror 22 at the position indicated by the solid line. Then, the cornea Ec of the eye E to be examined is
The anterior segment of the eye in the vicinity of Focus imaging unit 21b, movable mirror 22, condenser lens 25. The image is taken by an infrared television camera 27 through an imaging lens 26, and the anterior segment of the eye is displayed on a monitor television 29. The examiner can operate the fundus camera while observing this image.
眼底観察時には、前眼部照明ランプ30を消灯し、観察
用光源11を点灯すれば、赤外フィルタ12を透過した
眼底観察用の赤外光は、コンデンサレンズ13により中
空で透明である撮影用光源14の近傍に、またコンデン
サレンズ15によりリングスリット板16の近傍に、更
にリレーレンズ17により有孔ミラー18の近傍に集光
され、有孔ミラー18の鏡面部で反射されて左行し、対
物レンズ19により角膜Ecの近傍にリングスリット板
16のスリット形状に結像された後に眼底Efを照射す
る。そして、眼底Efで反射されて右行した光は、対物
レンズ19によりPlの位置に一旦結像した後に、有孔
ミラー18の中央孔、合焦レンズ20、二重焦点フレネ
ルレンズ21の長焦点結像部21aを通り、以後は前眼
部観察の場合と同様な光路を通ってモニタテレビ29に
映出される。検者はこの映像を観察して撮影部位の選定
及び合焦操作を行う。When observing the fundus, if the anterior ocular segment illumination lamp 30 is turned off and the observation light source 11 is turned on, the infrared light for fundus observation that has passed through the infrared filter 12 is transferred to a hollow, transparent photographing device by the condenser lens 13. The light is focused near the light source 14, near the ring slit plate 16 by the condenser lens 15, and near the perforated mirror 18 by the relay lens 17, reflected by the mirror surface of the perforated mirror 18, and travels to the left. After the object lens 19 forms an image in the vicinity of the cornea Ec in the shape of a slit of the ring slit plate 16, the fundus Ef is irradiated. The light reflected by the fundus Ef and traveling to the right is once imaged at the position Pl by the objective lens 19, and then passes through the central hole of the perforated mirror 18, the focusing lens 20, and the long focal point of the bifocal Fresnel lens 21. The light passes through the imaging section 21a and is then projected onto the monitor television 29 through the same optical path as in the case of anterior eye segment observation. The examiner observes this image and selects the area to be imaged and performs focusing operations.
眼底写真を撮影する場合には可動ミラー22を点線位置
に跳ね上げ、シャッタ23を開き撮影用光源14を瞬間
的に発光させれば、眼底観察時と同一光路を通って眼底
Efに光束が照射され、その反射光はフィルム24に到
達して眼底Efの写真撮影を行うことができる。従って
、前眼部観察時と眼底観察時とを切換える場合に、従来
例のように結像光学系の光路中に補助レンズを出し入れ
する必要は全くない。When photographing the fundus, the movable mirror 22 is moved up to the dotted line position, the shutter 23 is opened, and the photographic light source 14 is momentarily emitted, so that the light beam passes through the same optical path as when observing the fundus and illuminates the fundus Ef. The reflected light reaches the film 24, and the fundus Ef can be photographed. Therefore, when switching between observing the anterior segment of the eye and observing the fundus of the eye, there is no need to insert or remove the auxiliary lens into the optical path of the imaging optical system as in the conventional example.
二重焦点フレネルレンズ21の長焦点結像部21aと短
焦点結像部21bとは、必ずしも円環状に配置するとは
限らず、例えば市松模様状に配してもよいし、或いは屈
折力の異なる部分を両面に分割する場合もあり得る。ま
た、複数焦点を3点以上にすることも可能である。The long focus imaging section 21a and the short focus imaging section 21b of the bifocal Fresnel lens 21 are not necessarily arranged in an annular shape, but may be arranged in a checkered pattern, for example, or have different refractive powers. It is also possible to split the part into two sides. It is also possible to have multiple focal points of three or more.
更に、第4図に示す第2の実施例のように、写真撮影を
兼ねる位置には通常の球面レンズ33を配置し、観察の
みに用いられる光路に複数焦点光学系である二重焦点フ
レネルレンズ34を第1図の撮像レンズ26の代りに配
置してもよい、この場合には、写真撮影時には二重焦点
フレネルレンズ21が介在しないため、二重焦点フレネ
ルレンズ21に起因する光量損失やフレア等の不都合を
無くすることができる。Furthermore, as in the second embodiment shown in FIG. 4, a normal spherical lens 33 is placed in a position that also serves as a photographic lens, and a bifocal Fresnel lens, which is a multifocal optical system, is placed in the optical path used only for observation. 34 may be placed in place of the imaging lens 26 in FIG. It is possible to eliminate such inconveniences.
なお、上述の実施例は本発明を無散瞳眼底カメラに適用
した場合を示したが、その他にもアライメント時の光学
系と眼科検者用光学系とを併用する諸種の眼科機器に適
用できることは勿論である。Although the above-described embodiments show the case where the present invention is applied to a non-mydriatic fundus camera, the present invention can also be applied to various other ophthalmological instruments that use both an optical system for alignment and an optical system for an ophthalmological examiner. Of course.
[発明の効果]
以上説明したように本発明に係る眼科検査器械は、異な
る距離にある複数の被写体面を同一結像面に同時に結像
する複数焦点光学系と、その複数の被写体面を選択照明
する照明手段を用いることにより、被写体を切換えると
きに従来例のように光路中に光学系を出し入れする必要
がない、従って、光学系の出し入れ機構を省略できるた
め、機構の簡易化、製造コストの低減化に有利である。[Effects of the Invention] As explained above, the ophthalmological examination instrument according to the present invention includes a multi-focal optical system that simultaneously images a plurality of object planes located at different distances on the same imaging plane, and selects the plurality of object planes. By using an illumination means for illuminating, there is no need to take the optical system in and out of the optical path when switching objects as in the conventional example. Therefore, the mechanism for putting in and taking out the optical system can be omitted, simplifying the mechanism and reducing manufacturing costs. This is advantageous in reducing the
また、光学系の退避に要するスペースも不要になるため
、装置の小型軽量化や配置位置の自由度を増大できる等
の効果もある。更に、例えば合焦レンズを光路上大きく
移動させたり、被検眼に対して機械を大きく接近させた
り離したりする方式に比べて、切換え操作を迅速に行え
る利点もある。Further, since the space required for retracting the optical system is not required, there are also effects such as making the device smaller and lighter and increasing the degree of freedom in the arrangement position. Furthermore, there is an advantage that the switching operation can be performed more quickly than, for example, a method in which the focusing lens is largely moved along the optical path or the machine is moved largely toward or away from the eye to be examined.
図面第1図〜第4図は本発明に係る眼科検査器械の実施
例を示し、第1図は眼底カメラに適用した実施例の配置
図、第2図は二重焦点フレネルレンズの断面図、第3図
は波長特性のグラフ図、第4図は他の実施例の配置図で
あり、第5図、第6図は従来例の配置図である。
符号11は観察用光源、12.31は赤外フィルタ、1
4は撮影用光源、16はリングスリット板、18は有孔
ミラー、19は対物レンズ、20は合焦レンズ、21%
34は二重焦点フレネルレンズ、21aは球面レンズ、
22は可動ミラー、23はシャッタ、24はフィルム、
26は撮像レンズ、27は赤外テレビカメラ、29はモ
ニタテレビ、30は前眼部照明ランプ、32は遮光手段
、33は球面レンズである。
第3図
・ム
第5図
ム
4′61Drawings 1 to 4 show an embodiment of an ophthalmological examination instrument according to the present invention, FIG. 1 is a layout diagram of an embodiment applied to a fundus camera, and FIG. 2 is a sectional view of a bifocal Fresnel lens. FIG. 3 is a graph of wavelength characteristics, FIG. 4 is a layout diagram of another embodiment, and FIGS. 5 and 6 are layout diagrams of a conventional example. Reference numeral 11 is an observation light source, 12.31 is an infrared filter, 1
4 is a light source for photography, 16 is a ring slit plate, 18 is a perforated mirror, 19 is an objective lens, 20 is a focusing lens, 21%
34 is a bifocal Fresnel lens, 21a is a spherical lens,
22 is a movable mirror, 23 is a shutter, 24 is a film,
26 is an imaging lens, 27 is an infrared television camera, 29 is a monitor television, 30 is an anterior segment illumination lamp, 32 is a light shielding means, and 33 is a spherical lens. Figure 3/Figure 5 Figure 4'61
Claims (1)
に結像する複数焦点光学系と、前記複数の物体面を選択
して照明する照明手段とを備えたことを特徴とする眼科
検査器械。 2、前記複数焦点光学系の長焦点結像部は眼底を、短焦
点結像部は前眼部を前記結像面に結像するようにした特
許請求の範囲第1項に記載の眼科検査器械。[Claims] 1. A multi-focal optical system that simultaneously images a plurality of object planes located at different distances on the same imaging plane, and an illumination means that selectively illuminates the plurality of object planes. An ophthalmological examination instrument featuring: 2. The ophthalmological examination according to claim 1, wherein the long focus imaging section of the multifocal optical system images the fundus, and the short focus imaging section images the anterior segment of the eye on the imaging plane. instrument.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63036997A JPH01212536A (en) | 1988-02-19 | 1988-02-19 | Eye inspection device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63036997A JPH01212536A (en) | 1988-02-19 | 1988-02-19 | Eye inspection device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01212536A true JPH01212536A (en) | 1989-08-25 |
Family
ID=12485372
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63036997A Pending JPH01212536A (en) | 1988-02-19 | 1988-02-19 | Eye inspection device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01212536A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003010128A (en) * | 2001-07-02 | 2003-01-14 | Kowa Co | Ophthalmologic examination device |
-
1988
- 1988-02-19 JP JP63036997A patent/JPH01212536A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003010128A (en) * | 2001-07-02 | 2003-01-14 | Kowa Co | Ophthalmologic examination device |
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