JPS6017052B2 - Slit lamp photometering device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spotlight device used in a slit lamp configured to observe an eye to be examined illuminated with a slit-shaped light beam.

The slit lamp is used as an essential instrument for observing the eyeball, especially the anterior segment of the eye.

In recent years, as medical examinations have become more sophisticated and detailed, there has been an increasing need to take photographs of observed subjects. When taking a slit photograph, the light intensity of the photographing light source is adjusted according to the region to be photographed, the degree of opacity in the region, the photographing magnification, and the slit width. However, even for experienced photographers, it is difficult to determine exposure, so when taking photographs, it is common to take several photographs while changing the light intensity of the photographing light source. In order to eliminate the hassle of determining exposure, a light-receiving element is placed outside the optical path of the observation optical system so as to stare at the eyeball. There is something that determines exposure. However, in this type of side lighting, the average neck of the entire anterior segment produces only light, which is not desirable as a spotlighting device for a slit lamp that directs a slit-shaped light beam into the subject. The drawback was that it was directly affected by reflections on the surface. Also, it is conceivable to arrange the light-receiving element at a position conjugate to the film surface so that the central part of the film surface can be illuminated, but it would be a double effort to frame the film after the spotlight is placed on it, and it would also be expensive. Since the conditions of the illumination light change during lighting and framing, a spotlighting error will occur. The purpose of the present invention is to select the desired position within the screen after the framing is finished.

The purpose of the present invention is to provide a light device for a slit lamp that can emit light. The present invention will be described below based on embodiments shown in the drawings.

FIG. 1 shows an optical system of a slit lamp having a footlight device according to the present invention. The light from the eye to be examined 2 illuminated by the slit-like light of the illumination optical system 1 passes through the objective lens group 3 and becomes parallel light, which is transmitted to the first, second, and third beam splitters 4,
14 and 24 and then enters the second objective lens 5. Therefore, the observation image of the nuclear optometry 2 forms a striped image at the focal point 6 of the second objective lens 5. The examiner 7 observes the observed image of the eye to be examined using the eye lens 8.
can be observed. The light reflected by the first beam splitter 4 forms a photographed image of the eye to be examined at the position 101 of the heron point by the photographing lens 9. There is a film 11 at Kurama point position 10, and a photograph is taken. The light reflected by the second beam splitter 14 is focused by the imaging lens 15 at a focal position 16 on the neck of the subject's eye. Form a light image. A plurality of optical turtle conversion elements 17 are installed in the Kurao point position 16 in a plane perpendicular to the optical axis.
are distributed and arranged. Specifically, for example, as shown in FIG. 2a, the photoelectric conversion element 17 is
a, 17b, . . . are arranged linearly. The light emitting diode 27 is connected to the projection lens 25 and the third beam splitter 2.
4 and the second objective lens 5 are in a conjugate relationship with the observed image of the eye to be examined formed at the focal position 6 of the second objective lens 5. As shown in FIG. 2b, the light emitting diode 27 connects each photoelectric conversion element 17a, 17b, . . . on the image plane 6' of the eye to be examined.
The same number of photoelectric conversion elements are arranged so that there is a one-to-one correspondence with . Note that the dotted line in the middle of FIG. 2b is the photographable range.
With such a configuration, the examiner 7 can observe the image of the light emitting diode 27 superimposed on the image of the eye to be examined through the jugular lens 8 . Therefore, if the photoelectric conversion signal from the photoelectric conversion element 17 that corresponds to the light emitting diode 27 that corresponds to the cervical light part of the image of the eye to be examined is used as the optical signal,
Appropriate sidelight values can be obtained without disturbing the framing. Next, using FIGS. 3 and 4, a device for associating the light emitting diode 27 and the photoelectric conversion element 1.7 will be explained using an example in which it is applied to an automatic light control device using a strobe as a photographing light source. . In Figure 3, slide base 3
A shirt button 32 is provided at the end of a joystick 31 for moving the robot 0 back and forth, left and right on a stand (not shown). At the bottom of the joystick 31 is a neck for moving the side light point left and right. An optical layer changeover switch 33 is provided in a ring shape. Also, the lower part of Joystick 31 was handed over to the examiner.
A light screen switch 34 is provided. In FIG. 4, when the side light level changeover switch 33 is switched, the light emitting diode driver 41 is driven via the photoelectric conversion element/light emitting element selection decoder 40, and the light emitting element 27 is turned on. At the same time, a light emitting diode (e.g. 2
Since the light receiving element switch 42 connected to the photoelectric conversion element 17b'' corresponding to 7b) is closed, a side light current corresponding to the light intensity of the part where the light emitting diode 27b is lit flows into the front direct amplifier 43. . After introducing photographing information such as the film sensitivity setting switch 44 and the exposure compensation switch 45 into a well-known dimming circuit 46, when the shirt button 32 is pressed, the light emitting tube 47 emits light. Limelight position selector switch 3
The phototransformation element 17b selected in step 3 receives the reflected light from a predetermined part of the subject's eye, and the neck photocurrent is input to the front amplifier 43. The output of the front layer amplifier 43 is input to a dimming circuit 46 and integrated, and when the integrated amount reaches a constant value, the sea bream light circuit 46 stops the light emitting tube 47 from emitting light. Also,
When the photoelectric conversion element 17 is arranged in a plane as shown in FIG. This is necessary to switch the light area. By switching the storage light area control switch 34, the number of photoelectric conversion elements 17 used for shelf light can be changed to 1, 2, 4, 9, 1, etc. at the same time. Light emitting diode 27 is passed. The part that is emitting light will light up, indicating its neck9 light range. At this time, the spotlight position conversion switch 33 can be easily configured as a switch that changes the side light position while maintaining a constant side light area. Also, the head signal is input to the front layer amplifier 43 by moving the side light surface selection switch 34 to the setting. Optical fin conversion element 1 that simultaneously uses photocurrent for cervical light
In order to average by the number of 7, the sensitivity of the previous calendar amplifier 43 can be increased or decreased. Further, in this example, when driving the light emitting diode 27, the light emitting diode 27 is configured to be driven by the output of the pulse oscillator 48 so as to blink the light emitting diode 27 to draw the examiner's attention. Further, when photographing with a strobe, it is also possible to provide a configuration in which the observation light is side-lit in advance using the spotlight device of the present invention, and the amount of light emitted by the strobe is determined based on the received light value.

As described above, according to the slit lamp spotlight device of the present invention, the forehead.

The optical system is branched from the observation optical system, and a plurality of light emitting elements are distributed and arranged on the image forming surface of the optical system, and the optical position is displayed by superimposing the observation image on the forehead. You can easily move your neck to the desired position on the screen without disturbing it. Can be light.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the optical system of a slit lamp having a spotlight device according to the present invention, FIGS. Figures a and b are a plan view and a side view, respectively, showing a part of the automatic light control device; Figure 4 is a block diagram showing a device for associating light emitting diodes and photoelectric conversion elements applied to the automatic light control device; Figure 5 a and b
FIG. 2 is a diagram showing a two-dimensional arrangement of photoelectric conversion elements. Explanation of symbols of main parts, 1...Illumination optical system, 1
4...Second beam splitter, 15...
Imaging lenses, 17...Photoelectric conversion elements, 24...
...Third beam splitter, 25...Projection lens, 27...Light emitting diode, 40...
...Photoelectric conversion element/light emitting element selection decoder, 41...
... Light emitting diode driver, 42 ... Light emitting element switch, 47 ... Light emitting tube. Oh Zusai 2 Zuen 3 Zuzuen 4 Zuzu 5th

Claims (1)

[Scope of Claims] 1. In a slit lamp, a photometric optical system branched from an observation optical system and a projection optical system that merges into the observation optical system between the photometric optical system and an observation image are provided, and the test eye is A plurality of light-receiving elements are disposed in a distributed manner on the image-forming plane of the projection optical system, and a light-emitting element is arranged in a one-to-one correspondence with each of the light-receiving elements at a position conjugate to the observed image via the projection optical system. A photometric device characterized in that it is provided with interlocking means that can put corresponding light-receiving elements and light-emitting elements into an operating state.