JP2919919B2 - Ophthalmic imaging equipment - Google Patents

Description

The present invention relates to an ophthalmologic imaging apparatus capable of switching from a state in which an optical image of an eye to be inspected is observed through a finder to a state in which an image of the eye to be inspected is observed through a finder. Regarding improvement.

(Prior Art) When imaging an eye to be examined using an ophthalmologic photographing apparatus, an examiner irradiates observation light to the eye to be inspected, observes the eye to be inspected, and selects an imaging region. Next, the photographing switch is operated to irradiate the photographing light to the subject's eye to photograph the subject's eye.

At that time, the image of the eye to be inspected is recorded as an image of the eye to be inspected on the image recording device, and the image of the eye to be inspected is instantaneously reproduced and displayed on the image display means so that the photographing state of the eye to be inspected can be confirmed through the viewfinder immediately after photographing. There is something.

Conventionally, some ophthalmologic photographing apparatuses that allow an eye image to be inspected to be observed through the finder include a finder for observing an optical image of the eye to be inspected and a finder for observing the image of the eye to be inspected separately. Was. There is also known a structure in which one of a finder for observing an optical image of a subject's eye and a finder for observing an image of the subject's eye is selected and attached to a main body of an ophthalmologic photographing apparatus.

(Problems to be Solved by the Invention) However, in the former ophthalmologic photographing apparatus, it is necessary to take an eye from one finder and look into the other finder, and alternately look into the optical image of the eye to be examined and the image of the eye to be examined. Inconvenient. In the latter case, the finder must be replaced and mounted, which is more inconvenient.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an ophthalmologic imaging apparatus capable of easily observing an optical image of a subject's eye and an image of the subject's eye immediately after photographing while looking through a finder. Is to do.

(Means for Achieving the Object) In order to achieve the above object, the ophthalmologic photographing apparatus according to the present invention irradiates the subject's eye with observation light, observes the subject's optical image through a finder, and operates a photographing switch. Observation / photographing optical means for irradiating the eye to be examined with the photographing light to form an image of the eye to be examined on the imaging means; A display means for displaying an eye image reproduced by the recording / reproducing means; and a mirror provided on an optical path of the observation / photographing optical means, and an eye image for presenting the eye image to the viewfinder. Display mirror means, wherein the mirror passes through the finder from a state where the optical image of the subject's eye is observed through the finder by operating the photographing switch. Serial characterized in that it is switched to a state to observe the eye image.

(Operation) According to the present invention, when the observation light is applied to the eye to be inspected, the optical image of the eye to be inspected is observed through the finder. When the photographing switch is operated, the image of the eye to be inspected is recorded and reproduced in the recording / reproducing means, and the image of the eye to be inspected is displayed on the image display means. At the same time, the state where the reflection mirror can observe the optical image of the eye to be examined through the finder is switched to the state where the image of the eye to be inspected can be observed through the finder.

Embodiment An embodiment of an ophthalmologic photographing apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 is an optical diagram showing a configuration of a first embodiment of the present invention, in which a halogen lamp 1 as an observation light source, a condenser lens 2, a xenon lamp 3 as a photographing light source, and a relay lens 4 are arranged on an optical axis 5. Are arranged in order, the perforated mirror 8 and the eye to be examined
An illumination optical system is configured together with the objective lens 9 disposed opposite to the reference numeral 10. Here, the halogen lamp 1 and the xenon lamp 3 are conjugate to each other with respect to the condenser lens 2,
The xenon lamp 3 emits light when the photographing switch 7 is operated.

On the optical axis 27, the objective lens 9, the perforated mirror 8, the focusing lens 11, the imaging lens 12,
A quick return mirror 13 is provided, and a field lens 28 and an eyepiece 29 constituting a finder system are provided.
Are arranged. On the reflection optical axis 16 of the quick return mirror 13, a field lens 33 is provided.
On the reflected optical axis 34, a relay lens 35 and an imaging means 18 composed of a CCD are sequentially arranged, and constitute an observation / photographing optical means.

The imaging means 18 is connected to the signal processing circuit 22. The recording circuit 23 is connected to the signal processing circuit 22. Imaging means
The imaging signal 18 is magnetically recorded on the disk 24 by the recording circuit 23 for each frame as an eye image to be inspected. The eye image to be examined is instantaneously reproduced by the reproduction circuit 25. The recording circuit 23, the disk 24, and the reproducing circuit 25 constitute recording / reproducing means for recording / reproducing an eye image to be inspected formed on the imaging means as an eye image to be inspected. The image display means 26 is connected to the reproduction circuit 25.
The projection lens 36, the quick return mirror 13, and the image display means 26 constitute an eye-to-be-examined image display optical unit that displays an image of the eye to be inspected and switches from observation of an optical image through a finder to observation of an image of the eye to be inspected.

The quick return mirror 13 is at a position where the optical image of the eye to be inspected can be observed through the viewfinder, that is, at a position indicated by a dotted line in FIG.

When the halogen lamp 1 is turned on, the halogen lamp 1
Observation light is once converged to the position of the xenon lamp 3 by the condenser lens 2 and passes through the relay lens 4 to form the perforated mirror 8.
And is projected by the objective lens 9 near the iris of the eye 10 to be examined, thereby illuminating the fundus. The fundus reflected light is
Through the lens of the eye, exits from the cornea as a substantially parallel light beam,
Upon entering the objective lens 9, a fundus image is once formed in the air, and this fundus image passes through the hole 8 a of the perforated mirror 8.

The fundus image that has passed through the hole 8a is relayed by the imaging lens 12, passes through the field lens 28 and the eyepiece 29, and enters the observation eye I of the examiner. The examiner can thereby observe the optical image of the subject's eye.

Next, when the photographing switch 7 is operated, the operation of the photographing switch 7 causes the xenon lamp 3 to emit light, and the photographing light passes through the relay lens 4 and is incident on the subject's eye 10 in the same manner as the observation light. The reflected light is emitted from the cornea as a substantially parallel light flux, and a fundus image is formed by the objective lens 9.
On the other hand, the quick return mirror 13 moves to the position shown by the solid line in FIG. And
The light is reflected by the mirror 17 through the field lens 33 and is imaged on the image pickup means 18 through the relay lens 35.

The image signal of the imaging means 18 is signal-processed by a signal processing circuit 22 and is recorded on a disk 24 via a recording circuit 23. The fundus image recorded on the disk 24 is instantaneously reproduced by the reproduction circuit 25 and displayed on the image display means 26. Then, the image of the eye to be inspected by the image display means 26 is reflected by the quick return mirror 13 through the projection lens 36, enters the observation eye I of the examiner through the field lens 28 and the eyepiece 29, and the image of the eye to be inspected is observed. Is done.

In the first embodiment, a double-sided mirror is used as the quick return mirror 13, but the quick return mirror 13 is used.
When the thickness is small, only one surface can be a mirror surface and the other surface can be a polished surface.

After a lapse of a predetermined time, the quick return mirror 13 returns to the original position indicated by the dotted line in FIG.

FIG. 2 is an optical diagram showing a second embodiment of the ophthalmologic photographing apparatus according to the present invention. In this embodiment, a field lens 37 is arranged on the optical axis 27 with the quick return mirror 13 as a boundary and on the observation eye I side. The quick return mirror 13a and the eyepiece 29 are provided in this order. Then, the image display means 26
It is disposed opposite the quick return mirror 13a via the projection lens.

In the second embodiment, the quick return mirrors 13, 13
a is usually at the position shown by the dotted line in FIG.
The light is relayed by the imaging lens 12, passes through the field lens 37 and the eyepiece 29, and enters the observation eye I of the examiner as an optical image of the eye to be inspected. When the photographing switch 7 is operated, the quick return mirrors 13 and 13a are moved to the positions indicated by solid lines in FIG. 2, an eye image to be inspected is taken by the imaging means 18, and the image signal is instantaneously reproduced and displayed on the image display means 26. Is displayed. And
This eye image to be inspected is observed by the examiner's observation eye I via the projection lens 36, the quick return mirror 13a, and the eyepiece 29.

FIG. 3 is an optical diagram showing a third embodiment of the ophthalmologic photographing apparatus according to the present invention. The same components as those in the second embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. Only the elements will be described.

The xenon lamp 3 is controlled by a flash light source control unit 6 having a function described later, and the flash light source control unit 6 is operated based on a photographing switch 7.

A half mirror 45 is provided on the optical axis 27 between the imaging lens 12 and the field lens 37. This half mirror
Reference numeral 45 is used in place of the quick return mirror 13, and it is preferable to use a half mirror 45 having a reflectance of 10% and a transmittance of 90%. This half mirror 45 and imaging lens
A shutter 40 is inserted between the shutter 12 and the target image at the time of reproducing the eye image.

A field lens 38 and a prism 39 are provided on a reflection optical axis 42 of the quick return mirror 13a, and an eyepiece 29 is provided on a refraction optical axis 43 of the prism 39. In addition,
41 is a film recording means.

As shown in FIG. 4, the flash light source control means 6
It has a control circuit 30 (see Japanese Utility Model Laid-Open No. 57-45800). The primary winding of the transformer T is connected to the control circuit 30, and the rectifier circuit REC is connected to the secondary winding of the transformer T. Output terminal REC of the rectifier circuit REC ', between REC ", the capacitor C ₁ is connected. The capacitor C ₁
A series circuit comprising a capacitor C ₂ and a diode D ₁ Metropolitan is connected in parallel to the. Furthermore, between the output terminals of the rectifying circuit REC REC ', the REC ", a series circuit consisting of the diode D ₃ and the xenon lamp 3 which are connected. The control circuit 30 is connected to the output side of the detection circuit 31, detection circuit The input side of 31 is connected to the output terminal REC ″ of the rectifier circuit REC and the trigger circuit 32. The trigger circuit 32 is connected to a trigger electrode of the xenon lamp 3. The anode side of the diode D ₃ which is connected to the xenon lamp 3 is connected via the switch S ₁ to a connection point between the diode D ₁ and capacitor C _2. Figure 6 is a characteristic diagram of the switch element S _1, as the switching element S _1, using a silicon Symmetrical switch.

The xenon lamp 3 has a discharge characteristic as shown in FIGS. 5 (a) to 5 (c). When the photographing switch 7 is operated at time t0, the output signal of the control circuit 30 becomes the transformer T.
, And full-wave rectified by the rectifier circuit REC, and the capacitors C ₁ and C ₂ are charged by the obtained DC signal. here,
When the charging voltage reaches the symbol E shown in FIG.
The detection circuit 31 shown in the figure cuts off the power supply, and when the voltage drops, charges again, and the constant voltage E is maintained. Figure 5 (c) to be output emission trigger from the trigger circuit 32 at time t ₁ shown, emits light xenon lamp 3. In this case, the switching element S ₁
Potential difference across has to switch element S ₁ is OFF when the zero, only the charge of the capacitor C ₁ is discharged through the diode D _3.

Then, the discharge of the capacitor C ₁ as shown in Figure 4,
Voltage as shown in the EC1 of FIG. 5 (b) is reduced, the difference between the voltage EC2 of the capacitor C ₂ reaches the breakover voltage VBO of the switching element S _1, the time shown in FIG. 5 (c) t
Are turned ON switching element S ₁ in _2, light emission trigger from the trigger circuit 32 is outputted, the capacitor C ₂ begins to discharge. This is shown in EC ₂ of FIG. 5 (b), imaging light L ₂ by the light emission of the xenon lamp 3 has a waveform shown in FIG. 5 (a).

Flash light L generated by this xenon lamp 3
₂ is similarly reflected by the fundus through the relay lens 4 and guided to the objective lens 9, the perforated mirror 8, the focusing lens 11, and the imaging lens 12. On the other hand, the control signal output to the time t ₂ from the flash light source control means 6, the quick return mirror 13a rotates leave the position shown in dotted lines in Figure 3. Therefore, it is guided to the film recording means 41 and recorded.

According to this embodiment, the quick return mirror 13a
Is rotated while the xenon lamp 3 emits light, so that film recording and image recording of the fundus image can be performed without reducing the photographing light amount.

When the image is displayed by the image display means 26, the shutter
Since 40 is inserted between the imaging lens 12 and the half mirror 45, the eye image to be inspected can be clearly observed.

(Effects of the Invention) Since the present invention is configured as described above, it is possible to easily observe the optical image of the eye to be inspected and the image of the eye to be inspected immediately after photographing while looking through the viewfinder.

[Brief description of the drawings]

FIG. 1 is an optical diagram showing an overall configuration of a first embodiment of an ophthalmologic photographing apparatus according to the present invention. FIG. 2 is an optical diagram showing an overall configuration of a second embodiment of the ophthalmologic photographing apparatus according to the present invention. FIG. 6 to FIG. 6 show a third view of the ophthalmologic photographing apparatus according to the present invention.
FIG. 3 is a diagram showing an embodiment, FIG. 3 is an optical diagram showing the entire configuration, FIG. 4 is a circuit diagram showing a configuration of a flash light source control means, and FIGS. 5 and 6 show light emission states of the flash light source. FIG. DESCRIPTION OF SYMBOLS 1 ... Halogen lamp, 3 ... Xenon lamp 6 ... Flash light source control means 7, ... Shooting switch 8 ... Perforated mirror, 9 ... Objective lens 10 ... Eye to be examined, 13, 13a ... Quick return mirror 41: Film recording means, 18: Imaging means 23: Recording circuit, 24: Disc 25: Reproduction circuit, 26: Image display means 29: Eyepiece (finder system)

Claims (1)

(57) [Claims] An image of an eye to be inspected is formed on an imaging means by irradiating observation light on the film to be observed and observing an optical image of the eye to be inspected through a finder, and irradiating the eye with the imaging light by operating a photographing switch. Observation / photographing optical means, recording / reproducing means for recording / reproducing an eye image formed on the imaging means as a subject eye image, display means for displaying the eye image reproduced by the recording / reproducing means, and the observation A mirror provided in the optical path of the photographing optical unit, and a subject image display optical unit for presenting the subject's eye image to the viewfinder; andthe mirror is configured to operate the photographing switch through the viewfinder. An ophthalmologic imaging apparatus characterized in that the state of observing the optical image of the eye to be examined is switched to the state of observing the image of the eye to be examined through the finder.