JP3135927B2 - Fundus camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fundus camera used in, for example, an ophthalmic clinic.

[0002]

2. Description of the Related Art In a conventional fundus camera, a fundus image is captured by an electronic camera or a film camera. Film camera recording is excellent in resolution, but it takes time for development and cannot be used for immediate diagnosis, etc. There has also been proposed an apparatus in which a light splitting member such as a half mirror is provided in a system to guide a fundus image to an electronic camera or a film camera having different sensitivities and simultaneously perform both recordings.

[0003]

However, in the above-described prior art in which the light splitting member is provided in the image pickup optical system, the light flux may be split by one light emission, and the fundus image may be insufficient in light quantity. Also use electronic camera,
The luminous flux distribution rate is set in advance with a light amount suitable for each sensitivity of the film camera, and if the electronic camera or the film camera to be used is changed, there is a drawback that those sensitivities cannot be handled. Also, since the optical path switching and alignment with the child camera and film camera are performed every time,
Timing may be missed in fluorescent photography or the like.

An object of the present invention is to solve the above-mentioned drawbacks of the conventional example and to provide a fundus camera capable of recording a fundus image to both an electronic camera and a film camera or alternatively.

[0005]

According to the present invention, there is provided a fundus camera according to the present invention, which comprises a quick return for photographing a fundus image with a film camera and / or an electronic camera having different sensitivities. A fundus photographing optical system having a mirror, a flash light source for fundus photographing, and an electric charge corresponding to these light amounts for accumulating electric charges corresponding to these light amounts to cause the flash light source to emit light with a light amount suitable for the sensitivity of the film camera and the electronic camera. A plurality of capacitors; and control means for controlling the operation of the quick return mirror and the emission of the flash light source in accordance with a shooting start signal, wherein the control means controls the operation of the quick return mirror, and the control means controls the operation of the quick return mirror. And discharge the charge of the condenser corresponding to the order of the electronic camera and the flash light source. A continuous shooting mode in which the film camera and the electronic camera continuously emit light and perform shooting in the order of the film camera and the electronic camera; and discharging the electric charge of the capacitor so as to have a light amount suitable for one of the film camera and the electronic camera. And a single photographing mode for photographing with the film camera or the electronic camera can be selected.

[0006]

The fundus camera having the above configuration illuminates the fundus by continuously emitting light twice with the light amount suitable for the sensitivity of the electronic camera and the light amount suitable for the sensitivity of the film camera, and moves the quick return mirror with the light emission. Then, the fundus image is switched between the electronic camera photographing optical system and the film camera photographing optical system, and the light is guided to continuously photograph both eyes.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiments.

FIG. 1 shows a configuration diagram of an embodiment, in which a lens 2 and a xenon tube whose light quantity is variable as described later are provided on an optical path O1 from a continuously lit observation light source 1 to an eye E to be examined. A photographing flash light source 3, a lens 4, a perforated mirror 5, and an objective lens 6 are arranged. A lens 7, a quick return mirror 8, and a film F of a film camera 9 are arranged on an optical path O2 behind the perforated mirror 5. An optical finder 13 is arranged in the reflection direction of the quick return mirror 10. Further, a control means 14 is provided for controlling the entire fundus camera, and an electronic camera 12, a photographing selection means 15 having four push buttons, and drive circuits 16 and 17 are connected to the control means 14. The output of the drive circuit 16 is connected to the quick return mirror 8, and the output of the drive circuit 17 is connected to the quick return mirror 10. The quick return mirror 8 is inserted into and removed from the optical path O2 by these drive circuits 16 and 17. The quick return mirror 10 can be inserted into and removed from the optical path O3. Note that the observation light source 1 is conjugated to the imaging flash light source 3 by the lens 2, the imaging flash light source 3 is conjugated to the perforated mirror 5 by the lens 4, and furthermore to the pupil Ep of the eye E by the objective lens 6. It is conjugate.

FIG. 2 shows a configuration diagram of a light amount adjusting circuit of the photographing flash light source 3. The charging circuit 3a includes a photographing strobe condenser 3b, 3b ', a thyristor 3c, 3c', a resistor 3d, and a photographing flash light source 3. The thyristors 3 c, 3 c ′ which are connected and charged in the photographing strobe condenser 3 b or the photographing strobe condenser 3 b ′
The control means 14 is connected to the flash light source 3 for photographing via a camera, though not shown. In addition, a strobe condenser for photographing 3b,
3b 'is constituted by a plurality of capacitors. The control means 14 can arbitrarily select a capacitor, and the capacity of the imaging capacitors 3b and 3b 'is variable. Then, a trigger signal is input from the control means 14 to the thyristors 3c and 3c '.

At the time of observation / positioning, the driving circuit 16
17 makes the quick return mirrors 8 and 10 optical path O
2. The light source for observation 1 is turned on when inserted into O3 and O3, respectively. The light beam from the observation light source 1 travels on the optical path O1, is reflected by the perforated mirror 5 through the lens 2, the flash light source 3 for photography, and the lens 4, and is reflected by the eye E through the objective lens 6.
Is reflected by the quick return mirrors 8 and 10 through the aperture of the perforated mirror 5 and the lens 7 to return to the optical finder 13 and returns to the optical finder 13. Observe and align.

In the present invention, there are three types of photographing modes,
That is, it is possible to capture only the film camera 9, capture only the electronic camera 12, and capture both the film camera 9 and the electronic camera 12.
By pressing any one of push buttons A, B and C of No. 5, these photographing modes are selected.

3 to 5 show the operation states of the respective members in each photographing mode with the horizontal axis representing time. T1, T2, and T3 indicate the thyristor 3c and the thyristor 3 by the control means 14, respectively.
c ′ indicates the on / off state of the trigger signal input to the flash light source 3 for photographing. Note that before photographing, the capacitance of the photographing strobe condensers 3b and 3b 'is changed depending on the sensitivity of the film F and the electronic camera 12, and the photographing strobe condensers 3b and 3b' already have electric charges required for photographing. It is assumed that the battery is charged.

When taking an image with only the film camera 9, as shown in FIG. 3, the push button A of the photographing selection means 15 is turned on, and after the alignment is completed, the photographing button D is turned on. In the TA, the quick return mirror 8 is detached from the optical path O2, during which a pulse signal is sequentially input from the control means 14 to the thyristor 3c and the flash light source 3 for photographing, and the electric charge charged in the strobe condenser 3b for photographing is taken. The flash light source 3 is instantaneously discharged and the flash light source 3 for photographing emits light. This light beam proceeds in the same manner as during observation, and a fundus image is recorded by the film camera 9.

When taking an image with only the electronic camera 12, as shown in FIG. 4, the push button B of the image pickup selecting means 15 is turned on, and after the alignment is completed, the photographing button D is turned on. Quick return mirror 10 in TB
Is separated from the optical path O3, during which a pulse signal is sequentially input to the thyristor 3c 'and the photographing flash light source 3,
The flash light source 3 for photography is emitted by the electric charge charged to the flash condenser 3c 'for photography, and the electronic camera 1
At 2, the fundus image recording is performed.

In the case of taking an image with both the film camera 9 and the electronic camera 12, when the push button D of the image pickup selecting means 15 is turned on as shown in FIG. The photographing is performed continuously in the order of the recording by.

In the present invention, the strobe condensers 3b and 3b 'for photographing are provided separately for both photographing as described above, and the capacity of the condensers 3b and 3b' is variable by the control means 14. F. If these are changed depending on the sensitivity of the electronic camera 12, the light amount of the photographing flash light source 3 can be changed, and a clear fundus image without excessive or insufficient light amount can be obtained. Can be changed.

The photographing strobe condensers 3b and 3
The light quantity from the flash light source 3 for photography may be changed by interrupting the light emission current while keeping the capacity of b 'constant.

The insertion positions of the quick return mirrors 8 and 10 are not limited to the first embodiment. As shown in FIG. 6, a main part of the second embodiment shown in FIG. Quick return mirror 1 on optical path O2
0 'may be arranged, the mirror 18 may be arranged in the reflection direction of the quick return mirror 10', and the optical finder 13 may be arranged in the reflection direction of the mirror 18.

The operation of the members in each photographing mode in the second embodiment is as shown in FIGS. 7 and 8, respectively.
Although the operation of inserting and removing the quick return mirrors 8 and 10 'is slightly different, the other light emission procedures of the photographing flash light source 3 are the same as those in the first embodiment.

Further, as shown in the main part configuration diagram of the third embodiment shown in FIG.
It is also possible to arrange the quick return mirror 10 "on O2, arrange the mirror 18 in the reflection direction of the quick return mirror 10", and arrange the optical finder 13 in the reflection direction of the mirror 18.

FIGS. 11 to 13 show the operation of the members in each photographing mode in the third embodiment.

[0022]

As described above, the fundus camera according to the present invention enables photographing with a film camera and an electronic camera by using a flash light source to which a plurality of capacitors capable of continuous light emission are connected. In the case of performing continuous photographing, photographing is performed in the order of a film camera and an electronic camera, and a fundus image can be recorded without a timing shift.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is a configuration diagram of a light amount adjustment circuit of a photographing flash light source.

FIG. 3 is an explanatory diagram of an operation at the time of shooting with a film camera in the first embodiment.

FIG. 4 is an explanatory diagram of an operation at the time of shooting by an electronic camera in the first embodiment.

FIG. 5 is an explanatory diagram of an operation at the time of shooting with a film camera and an electronic camera in the first embodiment.

FIG. 6 is a configuration diagram of a main part of a second embodiment.

FIG. 7 is an explanatory diagram of an operation at the time of shooting with a film camera in the second embodiment.

FIG. 8 is an explanatory diagram of an operation at the time of shooting with an electronic camera according to the second embodiment.

FIG. 9 is an explanatory diagram of an operation at the time of shooting with a film camera and an electronic camera in the second embodiment.

FIG. 10 is a main part configuration diagram of a third embodiment.

FIG. 11 is an explanatory diagram of an operation at the time of shooting with a film camera in the third embodiment.

FIG. 12 is an explanatory diagram of an operation at the time of shooting with an electronic camera in the third embodiment.

FIG. 13 is an explanatory diagram of an operation at the time of shooting with a film camera and an electronic camera in the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Observation light source 3 Flash light source for photography 3a Charging circuit 3b, 3b 'Strobe condenser for photography 3c, 3c' Thyristor 8, 10, 10 ', 10 "quick return mirror 9 Film camera 12 Electronic camera 14 Control means 15 Photography selection means 16, 17 drive circuit

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-299235 (JP, A) JP-A-62-67524 (JP, A) JP-A-60-220323 (JP, A) 35341 (JP, U)

Claims (1)

(57) [Claims] 1. A film camera having different sensitivities and an electronic camera.
To take fundus images with one or both child cameras
A fundus shooting optical system with a quick return mirror ,
A flash light source for fundus photography, the film camera and
And the amount of light suitable for the sensitivity of the electronic camera.
Multiple condensers, each accumulating electric charge corresponding to these light amounts, to start the rush light source, and start shooting
The operation of the quick return mirror and the front according to the signal
Control means for controlling the emission of the flash light source,
The control means is used for switching the quick return mirror.
Corresponding to the order of the film camera and the electronic camera
Discharging the electric charge of the capacitor to the flash light source
Continuously emits light, and the film camera and the electronic camera
A continuous shooting mode for performing
So that the amount of light is suitable for one of the electronic cameras
Discharging the electric charge of the capacitor to the flash light source
And shoot with the film camera or the electronic camera.
A fundus camera characterized in that it is possible to select a single shooting mode for performing shadows .