JP3017259B2 - Fundus camera - Google Patents
Fundus cameraInfo
- Publication number
- JP3017259B2 JP3017259B2 JP2211358A JP21135890A JP3017259B2 JP 3017259 B2 JP3017259 B2 JP 3017259B2 JP 2211358 A JP2211358 A JP 2211358A JP 21135890 A JP21135890 A JP 21135890A JP 3017259 B2 JP3017259 B2 JP 3017259B2
- Authority
- JP
- Japan
- Prior art keywords
- illumination light
- eye
- illumination
- light source
- circuit
- 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.)
- Expired - Fee Related
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/14—Arrangements specially adapted for eye photography
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/12—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for looking at the eye fundus, e.g. ophthalmoscopes
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Biophysics (AREA)
- Ophthalmology & Optometry (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Eye Examination Apparatus (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、照明による被検眼の損傷防止を図ることの
できる眼底カメラに関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fundus camera capable of preventing an eye to be inspected from being damaged by illumination.
［従来の技術］ 眼底カメラでは、被検眼の観察、撮影に際し、照明光
源の照明光束を光学系を介して被検眼に導き、被検眼を
照明しているが、一定限度以上の過度の照明光量の照明
を持続して被検眼に与えると、被検眼が損傷を受ける。
この被検眼照明光量とこの被検眼照明光量を持続して被
検眼に与えたときに損傷を受けるまでの時間との関係
は、第２図に示す被検眼照明安全許容蓄積光量曲線Ａと
して知られている。この第２図において、横軸は被検眼
照明安全許容時間ｔを示し、縦軸は照明光量Ｗを示し、
これらの積Wtは被検眼照明安全許容蓄積光量である。こ
の被検眼照明安全許容蓄積光量曲線Ａから明らかなよう
に、一定限度以下の照明光量（照明光量a0以下）では、
被検眼は実質的に無限の時間の間、照明を受けたとして
も損傷を受けるには至らない。ここで、実質的にとは、
眼科機械を用いての観察、撮影に要する時間と較べた場
合の意味である。[Related Art] In a fundus camera, when observing and photographing an eye to be inspected, an illumination light flux of an illumination light source is guided to the eye to be inspected through an optical system to illuminate the eye to be inspected. If the illumination of the eye is continuously applied to the eye, the eye is damaged.
The relationship between the illumination light intensity of the subject's eye and the time until the eye is damaged when the illumination light of the subject's eye is continuously applied to the subject's eye is known as an eye safety safe accumulated light intensity curve A shown in FIG. ing. In FIG. 2, the horizontal axis represents the eye safety allowable time t of the subject's eye, the vertical axis represents the illumination light amount W,
The product Wt of these is the eye safety safe accumulated light quantity of the eye to be examined. As is clear from the eye illumination safety allowable accumulated light amount curve A, when the illumination light amount is less than a certain limit (illumination light amount a0 or less),
The subject's eye will not be damaged if illuminated for a virtually infinite amount of time. Here, substantially means
This is a meaning when compared with the time required for observation and photographing using an ophthalmic machine.
従って、この一定限度以下の照明光量（照明光量a0以
下）を用いて被検眼を照明し、観察、撮影を行うか、あ
るいは、ごく短い時間の間、被検眼を照明して撮影を行
う場合には、この被検眼照明安全許容蓄積光量曲線Ａを
ことさら考慮することは不要である。Therefore, when the subject's eye is illuminated and observed and photographed using the illumination light amount (illumination light amount a0 or less) which is equal to or less than the certain limit, or when the eye is illuminated and photographed for a very short time, It is not necessary to consider this eye illumination safety allowable accumulated light amount curve A.
ところで、観察、撮影に際しては、一定限度以上の過
度の照明光量（照明光量a0以上）を持続して被検眼に与
え、観察、撮影を行いたい事情が生じる場合もある。眼
底カメラでは、例えば螢光眼底撮影に際して赤外蛍光撮
影を行いたい場合があるが、この赤外蛍光撮影に際して
は、励起される波長の光量が弱くかつTVカメラの受光感
度も低いので、被検眼に一定限度以上の過度の照明光量
を持続して与えなければならず、被検眼が照明により損
傷を受けるおそれがある。By the way, when observing and photographing, there is a case where an excessive amount of illumination light exceeding a certain limit (illumination light amount a0 or more) is continuously applied to the subject's eye to perform observation and photographing. In the case of a fundus camera, for example, there is a case where it is desired to perform infrared fluorescence imaging when photographing a fluorescent fundus. In this infrared fluorescence imaging, the amount of light of the excited wavelength is weak and the light receiving sensitivity of the TV camera is low. Must be continuously provided with an excessive amount of illumination exceeding a certain limit, and the eye to be inspected may be damaged by the illumination.
そこで、従来は、照明光学系に分岐光路を設け、その
分岐光路に被検眼に対する照明光量を検出する照明光量
センサーを設けて、そのセンサーの検出出力に基づいて
照明光量を積算して被検眼照明安全許容蓄積光量と比較
して光量積算出力が被検眼照明安全許容蓄積光量を越え
たときに照明光量を一定限度以下に強制的に減少させて
被検眼の保護を図るようにしている。Therefore, conventionally, a branching optical path is provided in the illumination optical system, an illumination light amount sensor for detecting the amount of illumination light to the eye to be inspected is provided in the branching optical path, and the illumination light amount is integrated based on the detection output of the sensor. When the integrated light amount output exceeds the safety allowable accumulated light amount of the subject's eye compared with the safety allowable accumulated light amount, the illumination light amount is forcibly reduced to a certain limit or less to protect the subject's eye.
［発明が解決しようとする課題］ しかしながら、従来の眼底カメラでは、照明光量セン
サーを設置するために照明光路から分岐する分岐光学系
を別に設けなくてはならず、照明光学系が大型化し、ま
た、回路的にも構成が複雑となり、分岐光学系を設ける
ことと相まってコストが高くなる。[Problems to be Solved by the Invention] However, in a conventional fundus camera, a branch optical system that branches from an illumination optical path must be separately provided in order to install an illumination light amount sensor. Also, the configuration becomes complicated in terms of the circuit, and the cost increases in combination with the provision of the branch optical system.
そこで、本発明の目的は、照明光量センサーを設けな
くとも過度の照明光量に基づく被検眼の損傷の防止を図
ることができ、もって照明光学系のコンパクト化、回路
の構成の簡単化、コストの低減化を図ることのできる眼
底カメラを提供することにある。Therefore, an object of the present invention is to prevent the eye to be inspected from being damaged due to excessive illumination light quantity without providing an illumination light quantity sensor, thereby making the illumination optical system compact, simplifying the circuit configuration, and reducing the cost. It is an object of the present invention to provide a fundus camera capable of reducing the size.
［課題を解決するための手段］ 本発明に係る眼底カメラは、上記の目的を達成するた
めに、 照明光を発生させるための照明光源を有する眼底カメ
ラにおいて、 照明光を発生させるための照明光源と、 前記照明光源に与えられる電気的な物理量を検出して
照明光量と対応関係にある検出値を出力するための検出
回路と、 前記照明光源の照明光量と対応関係を有する被検眼照
明安全許容時間をそれぞれメモリーし、前記検出回路の
検出値に基づいて該検出値に対する被検眼照明安全許容
時間を指定するメモリー回路と、 被検眼に対する照明時間を計時する計時回路と、 該計時回路の計時時間が前記メモリー回路により指定
された被検眼照明安全許容時間を越えるという条件を満
足したときに、前記照明光源の発光量を減少させるよう
に前記照明光源の発光を制御する照明光源制御回路と、 を備えていることを特徴としている。[Means for Solving the Problems] To achieve the above object, a fundus camera according to the present invention is a fundus camera having an illumination light source for generating illumination light, the illumination light source for generating illumination light. A detection circuit for detecting an electrical physical quantity given to the illumination light source and outputting a detection value corresponding to the illumination light quantity; and an eye to be inspected having a safety relationship with the illumination light quantity of the illumination light source. A memory circuit for storing time, and a memory circuit for designating an eye safety safety time for the eye to be inspected for the detected value based on a detection value of the detection circuit; a clock circuit for clocking the illumination time for the eye to be inspected; a clock time for the clock circuit Satisfying the condition that the eye safety exceeds the allowable time for illumination of the eye to be inspected specified by the memory circuit, the illumination so as to reduce the light emission amount of the illumination light source. And an illumination light source control circuit for controlling light emission of the bright light source.
［作用］ 本発明に係る眼底カメラによれば、赤外蛍光撮影モー
ドの時、検出回路が照明光源に与えられる電気的な物理
量を検出し、予め設定された所定値と比較することによ
って、照明光源を制御する。[Operation] According to the fundus camera according to the present invention, in the infrared fluorescent imaging mode, the detection circuit detects the electrical physical quantity given to the illumination light source and compares it with a preset predetermined value to provide illumination. Control the light source.
好ましくは、 赤外蛍光撮影モードの時、検出回路が照明光源に与え
られる電気的な物理量を検出すると共に計時回路が被検
眼に対する照明時間を計時する。一方、メモリー回路に
は照明光源の照明光量に対応して、被検眼照明安全許容
時間がそれぞれメモリーされており、メモリー回路はそ
の検出値に基づいて検出電圧値に対する被検眼照明安全
許容時間を指定する。照明光源制御回路は、計時回路の
計時時間がメモリー回路により指定された被検眼照明安
全許容時間を越えるという条件を満足したときに、被検
眼の損傷を防止できるように照明光源の発光量を一定限
度以下に減少させる。Preferably, in the infrared fluorescence imaging mode, the detection circuit detects an electrical physical quantity given to the illumination light source, and the timing circuit measures the illumination time for the subject's eye. On the other hand, the memory circuit stores the permissible eye illumination safety time corresponding to the illumination light amount of the illumination light source, and the memory circuit specifies the permissible eye illumination safety time for the detected voltage value based on the detected value. I do. The illumination light source control circuit keeps the amount of light emitted from the illumination light source constant so as to prevent damage to the subject's eye when the condition that the time measured by the timing circuit exceeds the allowable eye illumination safety time specified by the memory circuit is satisfied. Reduce below limit.
［実施例］ 以下に、本発明に係る眼底カメラの実施例を図面を参
照しつつ説明する。Embodiment An embodiment of a fundus camera according to the present invention will be described below with reference to the drawings.
第１図は本発明に係る眼底カメラの一実施例を示し、
１は照明光学系、２は撮影光学系、Ｅは被検眼である。
照明光学系１は、被検眼照明用の照明光源３、コリメー
トレンズ４、撮影光源５、コリメートレンズ６、エキサ
イターフィルター７、リング絞り８、全反射ミラー９、
リレーレンズ10、穴空きミラー11を有している。FIG. 1 shows an embodiment of a fundus camera according to the present invention,
1 is an illumination optical system, 2 is a photographing optical system, and E is an eye to be examined.
The illumination optical system 1 includes an illumination light source 3, a collimating lens 4, an imaging light source 5, a collimating lens 6, an exciter filter 7, a ring stop 8, a total reflection mirror 9,
It has a relay lens 10 and a perforated mirror 11.
照明光源３は駆動回路12によって照明光を発生する。
照明光源３の照明光束はコリメートレンズ４によって集
光され、エキサイターフィルター７が光路に挿入されて
いるときには、そのエキサイターフィルター７の特性に
応じた波長の光束がリング絞り８に導かれる。リング絞
り８は被検眼Ｅの瞳孔と略共役位置に配置される。リン
グ絞り８を透過した照明光束は、全反射ミラー９、リレ
ーレンズ10、穴空きミラー11、接眼レンズ22を介して被
検眼Ｅに入射され、その眼底Egを照明する。The illumination light source 3 generates illumination light by a drive circuit 12.
The illumination light beam of the illumination light source 3 is condensed by the collimator lens 4, and when the exciter filter 7 is inserted in the optical path, a light beam having a wavelength according to the characteristics of the exciter filter 7 is guided to the ring stop 8. The ring stop 8 is arranged at a position substantially conjugate with the pupil of the eye E to be examined. The illumination light beam transmitted through the ring stop 8 is incident on the eye E through the total reflection mirror 9, the relay lens 10, the perforated mirror 11, and the eyepiece 22, and illuminates the fundus Eg.
その眼底Egからの光束は、接眼レンズ22を介して、穴
空きミラー11の穴部11aを通過して結像レンズ23に導か
れ、螢光眼底撮影の際には、バリヤフィルタ24が撮影光
学系２の光路中であって孔あきミラー11と結像レンズ23
の間に挿入され、TVカメラ25により眼底像が撮影され
る。なお、被検者には螢光眼底撮影のため、螢光剤が予
め静注される。また、フィルム記録の際には、クイック
リターンミラー26が矢印方向に駆動すると共にシャッタ
ー27が作動してフィルム28に眼底像が記録される。The luminous flux from the fundus Eg passes through an eyepiece 22 and passes through a hole 11a of a perforated mirror 11, and is guided to an imaging lens 23. Perforated mirror 11 and imaging lens 23 in the optical path of system 2
, And a fundus image is captured by the TV camera 25. In addition, a fluorescent agent is intravenously injected into the subject in advance for fluorescent fundus imaging. Further, at the time of film recording, the quick return mirror 26 is driven in the direction of the arrow, and the shutter 27 is operated to record the fundus image on the film 28.
駆動回路12には、照明光量調節器13が接続されてお
り、照明光源３の照明光量を「Ｌ」低〜「Ｈ」高の間で
調節できるようになっている。また、駆動回路12はモー
ド検出回路14に接続されており、このモード検出回路14
からのモード指定信号に基づき作動するようになってい
る。モード検出回路14は撮影モード切替えスイッチ15、
電圧検出回路16、アライメント完了検知回路17に接続さ
れている。撮影モード切替えスイッチ15は赤外蛍光撮影
モード「ICG」、可視蛍光撮影モード「Ｆ」、可視カラ
ー撮影モード「Ｎ」、「OFF」を選択できるようになっ
ている。An illumination light amount controller 13 is connected to the drive circuit 12 so that the illumination light amount of the illumination light source 3 can be adjusted between “L” low and “H” high. Further, the drive circuit 12 is connected to a mode detection circuit 14, and the mode detection circuit 14
It operates based on a mode designating signal from the PC. The mode detection circuit 14 has a shooting mode changeover switch 15,
The voltage detection circuit 16 and the alignment completion detection circuit 17 are connected. The photographing mode switch 15 can select an infrared fluorescent photographing mode "ICG", a visible fluorescent photographing mode "F", a visible color photographing mode "N", or "OFF".
撮影モード切替えスイッチ15において赤外蛍光撮影モ
ード「ICG」が選択されると、モード検出回路14の「IC
G」指定信号が電圧検出回路16に入力され、電圧検出回
路16は作動を開始する。電圧検出回路16は照明光源３に
印加されている電圧を検出する。照明光源３に印加され
る電圧と照明光源３の照明光量とは対応関係にある。電
圧検出回路16にはメモリー回路20が接続されている。メ
モリー回路20は照明光源３の照明光量と対応関係を有す
る被検眼照明安全許容時間をそれぞれメモリーし、電圧
検出回路16からの検出電圧値に基づいて、その検出電圧
値に対する被検眼照明安全許容時間を指定する。When the infrared fluorescence imaging mode “ICG” is selected by the imaging mode changeover switch 15, “IC
The “G” designation signal is input to the voltage detection circuit 16, and the voltage detection circuit 16 starts operating. The voltage detection circuit 16 detects a voltage applied to the illumination light source 3. The voltage applied to the illumination light source 3 and the illumination light amount of the illumination light source 3 have a corresponding relationship. The memory circuit 20 is connected to the voltage detection circuit 16. The memory circuit 20 stores the allowable eye illumination safety time corresponding to the illumination light amount of the illumination light source 3 based on the detected voltage value from the voltage detection circuit 16 based on the detected voltage value from the voltage detection circuit 16. Is specified.
アライメント完了検知回路17は、ここでは被検眼Ｅに
対するアライメントが完了し、かつ、撮影モード切替え
スイッチ15が「ICG」を選択されたという条件を満足す
るときには、計時開始信号を計時回路19に出力するよう
になっている。計時回路19はこの計時開始信号に基づき
計時を開始する。アライメントが完了していないときに
は、眼底Egを照明していたとしても過度の照明光束が眼
底に照射されているとは限らず、眼底Egにダメージを与
えるとは限らないからである。The alignment completion detection circuit 17 outputs a timing start signal to the timing circuit 19 when the alignment with respect to the eye E to be examined is completed and the condition that the photographing mode switch 15 is set to “ICG” is satisfied. It has become. The timing circuit 19 starts timing based on the timing start signal. This is because, when the alignment is not completed, even if the fundus oculi Eg is illuminated, an excessive illumination light beam is not always radiated to the fundus and the fundus Eg is not necessarily damaged.
計時回路19とメモリー回路20とは比較回路21に接続さ
れ、比較回路21は計時回路19の計時時間ｔとメモリー回
路20で指定された被検眼照明安全許容時間Ｔとを比較す
る。ここで、被検眼照明安全許容時間Ｔは予め設定され
た所定値である。この比較回路21は計時回路19の計時時
間ｔがメモリー回路20で指定された被検眼照明安全許容
時間Ｔを越えるという条件を満足したときに照明光源３
の発光を停止させる照明光源制御回路18を駆動回路12と
共に構成している。The clock circuit 19 and the memory circuit 20 are connected to a comparison circuit 21, and the comparison circuit 21 compares the clock time t of the clock circuit 19 with the eye safety allowable time T specified by the memory circuit 20. Here, the eye illumination safety allowable time T is a predetermined value set in advance. The comparison circuit 21 determines that the illumination light source 3 has been activated when the condition that the time t of the time measurement circuit 19 exceeds the allowable eye illumination safety time T specified by the memory circuit 20 is satisfied.
An illumination light source control circuit 18 for stopping the light emission of the light source is configured together with the drive circuit 12.
ここでは、メモリー回路20は、操作ツマミ13aの操作
に対応して検出電圧値に対する被検眼照明安全許容時間
を更新指定する。例えば、操作ツマミ13aがｐの位置に
あるときの検出電圧値Ｖに対する被検眼照明安全許容時
間Ｔが指定されているとして、操作ツマミ13aをｐ′の
位置に変更したとき検出電圧値Ｖ′に対する被検眼照明
安全許容時間Ｔ′を更新指定する。従って、照明光量調
節器13の操作ツマミ13aがｐの位置にあり、検出電圧値
がＶのときにメモリー回路20により指定された被検眼照
明安全許容時間がＴであるとすると、操作ツマミ13aが
そのｐに固定したままのときは、計時時間ｔがＴを越え
たときに比較回路21が駆動回路12の作動を停止させ、照
明光源３が発光を停止する。一方、この照明途中で、照
明光量調節器13の操作ツマミ13aを照明光量を増加させ
る方向に操作してｐからｐ′に変更し、ｐ′に位置させ
たとする。このときの検出電圧値をＶ′、被検眼照明安
全許容時間をＴ′とするとこの場合にもＴ′＜ｔという
条件が満足される。よって、同様に照明光源３は発光停
止される。なお、照明光量を減少させつつ、照明を行な
う場合、撮影が終了するまでに被検眼への総照明光量が
被検眼照明安全許容蓄積光量を越え、被検眼に損傷を与
えるという危惧があるが、そもそも被検眼照明安全許容
蓄積光量は安全を見込んであるので、その心配はない。Here, the memory circuit 20 updates and specifies the eye-safety time for the eye to be inspected with respect to the detected voltage value in accordance with the operation of the operation knob 13a. For example, assuming that the eye illumination safety allowable time T with respect to the detected voltage value V when the operation knob 13a is at the position p is designated, the detection voltage value V 'is changed when the operation knob 13a is changed to the position p'. The eye illumination safety allowable time T ′ is designated for update. Therefore, assuming that the operation knob 13a of the illumination light amount controller 13 is at the position of p and that the eye safety safety time designated by the memory circuit 20 is T when the detected voltage value is V, the operation knob 13a When the time remains at p, when the time t exceeds T, the comparison circuit 21 stops the operation of the drive circuit 12 and the illumination light source 3 stops emitting light. On the other hand, it is assumed that during the illumination, the operation knob 13a of the illumination light amount controller 13 is operated in the direction of increasing the illumination light amount to change from p to p 'and to be positioned at p'. Assuming that the detected voltage value at this time is V 'and the eye safety safety time of the subject's eye is T', the condition of T '<t is satisfied also in this case. Therefore, similarly, the illumination light source 3 stops emitting light. In addition, when performing illumination while reducing the illumination light amount, there is a concern that the total illumination light amount to the eye to be inspected exceeds the eye safety safe accumulated accumulated light amount to the eye to be inspected by the time the imaging is completed, and may damage the eye to be inspected. In the first place, there is no need to worry about the eye-safety of the eye to be inspected because the safety allowable accumulated light quantity is expected to be safe.
以上、実施例について説明したが、操作ツマミ13aの
位置をｐからｐ′に変更してもメモリー回路20は、被検
眼照明安全許容時間Ｔを更新しない構成とすることもで
きる。Although the embodiment has been described above, the memory circuit 20 may be configured not to update the eye safety safety time T even if the position of the operation knob 13a is changed from p to p '.
［発明の効果］ 本発明に係る眼底カメラによれば、照明光を発生させ
るための照明光源と、前記照明光源に与えられる電気的
な物理量を検出して照明光量と対応関係にある検出値を
出力するための検出回路と、前記照明光源の照明光量と
対応関係を有する被検眼照明安全許容時間をそれぞれメ
モリーし、前記検出回路の検出値に基づいて該検出値に
対する被検眼照明安全許容時間を指定するメモリー回路
と、被検眼に対する照明時間を計時する計時回路と、該
計時回路の計時時間が前記メモリー回路により指定され
た被検眼照明安全許容時間を越えるという条件を満足し
たときに、前記照明光源の発光量を減少させるように前
記照明光源の発光を制御する照明光源制御回路とを備え
ているので、照明光学系内に新たな光学要素を設けなく
とも過度の照明光量に基づく被検眼の損傷の防止を図る
ことができ、もって照明光学系のコンパクト化、回路の
構成の簡単化、コストの低減化を図ることのできる眼底
カメラを提供できる。[Effects of the Invention] According to the fundus camera according to the present invention, an illumination light source for generating illumination light, and an electrical physical quantity given to the illumination light source are detected, and a detection value corresponding to the illumination light amount is detected. A detection circuit for outputting, and an eye illumination safety allowable time having a correspondence relationship with an illumination light amount of the illumination light source are respectively stored, and based on a detection value of the detection circuit, an eye illumination safety allowable time for the detection value is stored. A memory circuit to be specified, a clock circuit for measuring the illumination time for the eye to be inspected, and the illumination when the condition that the clock time of the clock circuit exceeds the allowable eye illumination safety time specified by the memory circuit is satisfied. An illumination light source control circuit that controls light emission of the illumination light source so as to reduce the light emission amount of the light source, so that a new optical element is not provided in the illumination optical system. It is possible to provide a fundus camera that can prevent the eye to be inspected from being damaged due to an excessive amount of illumination light, and thus can make the illumination optical system compact, simplify the circuit configuration, and reduce the cost.
第１図は本発明に係る眼底カメラの実施例を説明するた
めの全体構成図、 第２図は被検眼照明安全許容蓄積光量曲線図である。 ３……照明光源、16……電圧検出回路、18……照明光源
制御回路、19……計時回路、20……メモリー回路FIG. 1 is an overall configuration diagram for explaining an embodiment of a fundus camera according to the present invention, and FIG. 3 ... Illumination light source, 16 ... Voltage detection circuit, 18 ... Illumination light source control circuit, 19 ... Timekeeping circuit, 20 ... Memory circuit
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) A61B 3/14 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) A61B 3/14
Claims (1)
明光量と対応関係にある検出値を出力するための検出回
路と、 前記照明光源の照明光量と対応関係を有する被検眼照明
安全許容時間をそれぞれメモリーし、前記検出回路の検
出値に基づいて該検出値に対する被検眼照明安全許容時
間を指定するメモリー回路と、 被検眼に対する照明時間を計時する計時回路と、該計時
回路の計時時間が前記メモリー回路により指定された被
検眼照明安全許容時間を越えるという条件を満足したと
きに、前記照明光源の発光量を減少させるように前記照
明光源の発光を制御する照明光源制御回路と、 を備えていることを特徴とする眼底カメラ。An illumination light source for generating illumination light; a detection circuit for detecting an electrical physical quantity given to the illumination light source and outputting a detection value corresponding to the illumination light amount; A memory circuit for storing respective allowable eye illumination safety times corresponding to the illumination light amount of the light source, and designating an eye safety safe time for the detected value based on the detection value of the detection circuit; and illumination for the eye. A time counting circuit that counts time, and when the time measured by the time counting circuit exceeds the eye safety safety allowable time specified by the memory circuit, the light emission amount of the illumination light source is reduced. An illumination light source control circuit that controls light emission of the illumination light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2211358A JP3017259B2 (en) | 1990-08-09 | 1990-08-09 | Fundus camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2211358A JP3017259B2 (en) | 1990-08-09 | 1990-08-09 | Fundus camera |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0492640A JPH0492640A (en) | 1992-03-25 |
| JP3017259B2 true JP3017259B2 (en) | 2000-03-06 |
Family
ID=16604649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2211358A Expired - Fee Related JP3017259B2 (en) | 1990-08-09 | 1990-08-09 | Fundus camera |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3017259B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4280563B2 (en) | 2003-06-20 | 2009-06-17 | キヤノン株式会社 | Ophthalmic imaging equipment |
-
1990
- 1990-08-09 JP JP2211358A patent/JP3017259B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0492640A (en) | 1992-03-25 |
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