JP3042872B2 - Ophthalmic equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an ophthalmologic apparatus.

2. Description of the Related Art Conventionally, an ophthalmologic apparatus represented by a fundus camera and a slit lamp is used by illuminating observation light with an anterior eye or a fundus. It is also known that if the illumination light has a light amount exceeding a certain threshold, it is harmful to human eyes if irradiated for a long time.

However, this type of ophthalmologic apparatus usually remains lit even when the examiner removes his / her eye from the eyepiece, unless the examiner intentionally presses the switch. In addition, the subject also kept his / her face fixed on the apparatus unless otherwise specified by the examiner.

[Problems to be Solved by the Invention] Therefore, the subject is continuously exposed to the illumination light for a long time without any need for observation, which is not only harmful to the eyes of the subject, but also a light source for illumination. There is a drawback that the life is shortened.

The present invention has been devised in view of the above-described drawbacks, and it is an object of the present invention to provide an ophthalmologic apparatus capable of reducing the pain of a subject, suppressing consumption of a light source for illumination, and further saving power. .

Means for Solving the Problems In order to achieve the above object, the present invention provides an ophthalmologic apparatus having an illumination optical system for illuminating an eye to be examined and an observation optical system for observing the eye to be examined. And a control unit for controlling the light amount of the illumination optical system based on the detection result by the detection unit.

Further, the detecting means includes a light projecting means for projecting the measuring light toward the examiner, and a light receiving means for receiving the reflected light of the projected measuring light.

Further, the observation optical system is provided with an eyepiece, and the detection means has a contact switch arranged close to the eyepiece.

[Operation] According to the present invention, when observing an object, the examiner's head is located at the eyepiece section, and the detecting means automatically detects contact or approach of the head, thereby illuminating light. Is controlled to irradiate the eye to the subject. On the other hand, when the examiner's head separates from the eyepiece and interrupts observation, the detecting means automatically detects that the head is not in the eyepiece and turns off or reduces the illumination light. Is controlled.

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a fundus camera according to the present embodiment, and FIG. 2 is a view as viewed from an arrow A showing a part thereof.

In FIG. 1, 1 is a base, and 2 is an operation stand section slidably mounted on the base 1. Reference numeral 3 denotes a joystick which can move the operation stand unit 2 forward, backward, left, right, and up and down. Further, a shutter switch 4 of a camera unit 7 described later is attached to an upper portion of the joystick 3.

A main body 5 is mounted on the operation stand 2. The main body 5 has an illumination light source therein, and illuminates the eye E2 through an illumination optical system (not shown) forming an internal optical path I and an objective lens 12. The main body 5 has an observation optical system (not shown) for forming an optical path II therein.
The examiner's eye E1 observes the fundus of the subject's eye E2 via the eyepiece 8. Further, the main body 5 has a photographic optical system (not shown) for forming an optical path III, and
The fundus is photographed. The illumination optical system described above,
The observation optical system and the photographing optical system do not need to be particularly novel, but may be well-known ones. Reference numeral 6 denotes a knob for fixing the main body 5 to be swung.

At the position facing the examiner's forehead at the top of the main body 5,
A sensor unit 9 for determining whether or not the examiner's head is at the observation position is provided. As shown in FIG. 2, the sensor unit 9 has a light emitting diode 10 that projects light to the examiner's forehead located at the eyepiece, and a light receiving element 11 that receives reflected light. The light emitting diode 10 emits infrared light, and the light receiving element
Before 11 is an infrared transmission filter that transmits only infrared light.
a is provided.

Reference numeral 13 denotes a chin rest, which has a chin rest 15 and a forehead support 16.
Reference numeral 14 denotes a knob for vertically moving the chin rest 15. 17 is a fixation light.

Next, a method of controlling the fundus camera will be described with reference to FIG.

Reference numeral 20 denotes a CPU which is built in the main unit 5 and performs the following control.

21 is a control switch, which is a shutter signal,
Alternatively, signals such as camera type, flash light amount, and level setting for observation illumination are sent to the CPU. And this C
The PU 20 controls the light amount and timing of the strobe 23 via the strobe control circuit 22. The CPU 20 is a lighting drive circuit 24
, The light amount of the illumination light source 25 and the like are controlled. The camera section 7 is also controlled via the camera control circuit 26. A display 27 for displaying various data is provided with a data display control circuit 28.
Through the CPU 20.

The number of pulses and the amount of light of the light emitting diode 10 are controlled by the CPU 20 via the LED drive circuit 29, and emits intermittent infrared pulse light when the power is turned on. The light receiving element 11 receives the infrared light from the light emitting diode 10 transmitted through the infrared transmission filter 11a, and the CPU 20 via the level determination circuit 30 has the examiner's head in the eyepiece. Or not. Light receiving element
The CPU 20 that has received the signal from 11 controls the illumination light source 25 via the illumination drive circuit 24, and diminishes the illumination light so as not to harm the examinee when there is no examiner. Further, a control method of controlling to turn off the illumination when there is no examiner can be adopted.

Further, as a known detection element, a pyroelectric detection element that detects infrared light emitted from a human body may be used.

Second Embodiment FIG. 4 is an external view of a side portion showing a slit lamp according to a second embodiment.

Reference numeral 31 denotes a gantry. The gantry 31 has a power switch 32.
Also, an illumination lamp voltage switching switch 33 is attached. A base 34 is mounted on the upper surface of the gantry 31 and can be moved by a joystick 35. Reference numeral 36 denotes a microscope arm for holding a microscope section 37.
Constitute an observation optical system. 37a is an eyepiece.

One end of a forehead arm 38 as shown in FIG. 5 is fixed to the upper part of the microscope section 37. A forehead arm 39 as shown in the figure is provided at the tip of the forehead arm 38, and a contact switch 40 for controlling a lighting power source, which will be described later, is provided at the center of the front surface.
Are protruding. Reference numeral 38a denotes a knob for adjusting the length of the arm 38 in accordance with the diopter adjustment of the microscope unit 37.

Reference numeral 41 denotes an illumination unit for illuminating the anterior segment of the subject's eye by reflection from the mirror 42, and reference numeral 43 denotes an illumination arm for holding the illumination unit 41.

Reference numeral 44 denotes a headrest portion, which includes a chin rest 45 and a forehead rest 46.
With. Reference numeral 47 denotes a fixation lamp for the subject to fixate.

Next, the illumination unit of the slit lamp having the above configuration
The control circuit 41 will be described with reference to FIG.

Reference numeral 51 denotes a transformer for transforming a voltage from a power supply, and reference numeral 33 denotes a voltage switching switch as described above. 40 is forehead 39
Is a contact switch provided on the switch. Reference numeral 52 denotes a dimming resistor provided in parallel with the contact switch 40. Reference numeral 53 denotes a halogen lamp serving as an illumination light source.

When the contact switch 40 is on, the current which is transformed by the transformer 51 and has the voltage set by the voltage switch 33 almost passes through a to illuminate the halogen lamp 53 brightly. On the other hand, when the contact switch 40 is off, the current passes through the resistor b, so that the halogen lamp 53
Is dimmed. If b is removed, the halogen lamp 53 can be turned off when the contact switch 40 is turned off.

Further, it goes without saying that the present invention is not limited to the above embodiment, but can be applied to various ophthalmologic apparatuses such as an ophthalmometer and an eyepiece type lens meter.

[Effect] According to the ophthalmologic apparatus of the present invention, it is possible to reduce the pain of the subject, suppress the consumption of the illumination light source, and further save power.

[Brief description of the drawings]

FIG. 1 is a side view showing a fundus camera according to a first embodiment.
FIG. 2 is a view as viewed from the direction of the arrow A showing a part thereof. FIG. 3 is a block diagram showing a control method of the fundus camera. FIG. 4 is a side view showing the slit lamp of the second embodiment. FIG. 5 is a perspective view showing a forehead rest. FIG. 6 is a circuit diagram showing a control method of the illumination unit of the slit lamp. 10 Light-emitting diode 11 Light-receiving element 20 CPU 25 Lighting light source 33 Voltage switch 40 Contact switch 51 Transformer 52 Resistor 53 Halogen lamp

Claims (3)

(57) [Claims] 1. An ophthalmologic apparatus having an illumination optical system for illuminating an eye to be inspected and an observation optical system for observing the eye to be inspected, detecting means for detecting whether or not an examiner who observes the eye to be inspected is at a predetermined observation position. An ophthalmologic apparatus comprising: a control unit configured to control a light amount of the illumination optical system based on a detection result of the detection unit. 2. The ophthalmologic apparatus according to claim 1, wherein said detecting means includes a light projecting means for projecting measuring light toward an examiner, and a light receiving means for receiving reflected light of the projected measuring light. Ophthalmic device. 3. An ophthalmologic apparatus according to claim 1, wherein said observation optical system has an eyepiece, and said detecting means has a contact switch arranged close to said eyepiece. apparatus.