JP2000254098A - Ophthalmologic device having subject detecting function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ophthalmologic device capable of judging which eye, right or left, is to be checked without being influenced by brightness and disturbance light from sunlight or an incandescent electric lamp. SOLUTION: A subject detecting means 8 for detecting whether an area of the body of a subject exist within a prescribed distance is provided on an ophthalmologic device. This means 8 is constituted by a light emitting element 8d, a light receiving element 8e, an oscillation circuit 8f, a driver 8g and a high-pass circuit 8h. A signal of a frequency of 1 kHz outputted from the oscillation circuit 8f is inputted to the driver 8g, and the driver 8g emits an infrared index light which goes on and off at a frequency of 1 kHz from the light emitting element 8d based on this signal. The light receiving element 8e receives a reflected light which is emitted from the light emitting element 8d and irradiated to the subject, and generates a signal corresponding to it. The high-pass circuit 8h cuts frequency component lower than 1 kHz, and outputs a signal of a frequency more than 1 kHz to a control circuit C1 as a detected signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic apparatus having a subject detecting function, and more particularly to an ophthalmic apparatus having a function of detecting a subject while avoiding the influence of disturbance light emitted from sunlight, incandescent light, fluorescent light, or the like. The present invention relates to an ophthalmologic apparatus having a function of detecting and further determining which of the left and right eyes of a subject is the subject's eye.

[0002]

2. Description of the Related Art An ophthalmologic photographing apparatus for photographing a cornea and a fundus of an eye to be examined is a kind of ophthalmologic apparatus. In such an ophthalmic imaging apparatus, the subject's head is brought into contact with a face pad attached to the apparatus, the head is supported so as not to move, and then the alignment, working distance adjustment, and the imaging optical system serving as a main optical system , That is, shooting is performed. The face rest is composed of a forehead and a chin rest, and the subject applies his forehead to his forehead and places his chin on the chin rest. When the start switch of the device is pressed while the head is fixed to some extent in this way, the alignment of the imaging optical system with respect to the eye to be examined is automatically performed, and the imaging optical system is gradually advanced toward the eye to be examined. The imaging optical system is driven (driven in the Z-axis direction) to reach an operating position with respect to the eye to be examined. Note that the alignment means that the optical axes of the photographing optical system and the observation optical system in the ophthalmologic photographing apparatus coincide with the vertex of the eye to be inspected.

In the above-described ophthalmologic photographing apparatus, as described above, the subject starts the apparatus with the forehead resting on the forehead or placing the chin on the chin rest and fixing the head to some extent. It is necessary to press a switch. However, even if such a device is provided with a function for automatically adjusting the working distance, a considerable time is required for adjusting the working distance. The subject needs to remain tense while the device adjusts the working distance. For example, in order to adjust the working distance, the photographing optical system is moved in the optical axis direction of the subject's eye (Z axis direction).
The subject cannot be moved while the head is fixed with respect to the face rest of the apparatus, and the subject cannot blink. In this way, a mental burden is imposed on the subject.

[0004]

In order to eliminate such a mental burden on the subject, the subject is detected when approaching, and the main optical system is controlled based on the detection result. The inventors of the present invention have already disclosed an ophthalmologic apparatus configured to be moved to a predetermined standby position for optometry (Japanese Patent Application No. 10-268082). In this ophthalmologic apparatus, the indicator light such as infrared light is emitted from the light emitting element, and this index light is reflected if the subject is near the ophthalmic apparatus,
By detecting this with the light receiving element, the presence or absence of the subject is determined. According to this ophthalmologic apparatus, quick alignment can be performed, and the mental burden on the subject, who cannot fix his head and blink, can be eliminated.

However, in this ophthalmologic apparatus, it is determined that the subject is approaching even when light from the sun or an incandescent light bulb is applied to the light receiving element, and the main optical system is moved to a predetermined standby position with respect to the subject's eye. It may be moved, which may cause inconvenience in use near windows exposed to sunlight or under an incandescent lamp.

In the above-mentioned ophthalmic apparatus, when the subject approaches a body part such as a face to the ophthalmic apparatus in order to undergo an eye examination or the like, either the left or right eye of the subject is examined. Cannot be determined, the person performing the test records which of the left and right eyes of the subject is the subject's eye at the time of the test, or informs which of the left and right eyes is the subject's eye at the time of the test For example, it is necessary to provide a push button or the like for recording by pressing the test subject. However, such records are often forgotten, and if they are forgotten, it is necessary to carry out another inspection.

The present invention has been made to solve such problems of the prior art, and an object of the present invention is not to be affected by disturbance light from sunlight, an incandescent light bulb, and the like. An object of the present invention is to provide an ophthalmologic apparatus that can automatically determine which of the left and right eyes of a subject is the subject's eye.

[0008]

In order to achieve the above object, an ophthalmologic apparatus according to the present invention provides a subject detection apparatus for detecting whether or not a body part of the subject exists within a predetermined distance. The subject detection means includes a light emitting element, a light receiving element, and a control unit. The light emitting element emits an index light that blinks at a predetermined frequency according to a signal from the control unit, and the control unit detects only a signal of the component of the predetermined frequency among signals generated in the light receiving element due to reflected light of the index light by the subject. . If the body part such as the face of the subject is not located near the ophthalmic apparatus, the light receiving element generates only a signal due to disturbance light from sunlight, which can be regarded as stationary, incandescent light bulbs and the like,
Therefore, only a DC component is generated in the light receiving element. On the other hand, when a body part such as the face of the subject is located near the ophthalmologic apparatus, light blinking at a predetermined frequency from the light emitting element is reflected by the face of the subject or the like, and the light receiving element has the predetermined frequency. A signal having the AC component is generated, and the presence of the face or the like of the subject can be known by detecting the signal by the control unit.

Further, in the ophthalmologic apparatus of the present invention, by providing a plurality of the above-described subject detecting means, in addition to being able to detect the presence of the face and the like of the subject as described above, the plurality of the subject can be detected. The position of a body part such as the face of the subject is determined based on which of the examiner detecting means has detected the signal of the predetermined frequency component, whereby either the left or right eye is the subject's eye. Can be determined.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An ophthalmologic apparatus according to the present invention includes a main optical system and subject detection means for detecting whether or not a body part of the subject exists within a predetermined distance. An ophthalmologic apparatus, wherein the subject detection means has a light emitting element, a light receiving element, and a control unit, and the light emitting element emits an indicator light that blinks at a predetermined frequency according to a signal from the control unit, and the control unit The unit detects only a signal of the component of the predetermined frequency among signals generated in the light receiving element due to reflected light of the index light by the subject.

With this configuration, it is possible to detect an AC component of a predetermined frequency of a signal generated in the light receiving element by the light reflected from the face of the subject or the like, and the subject is not affected by disturbance light. The presence of a face etc. can be known.

[0012] The ophthalmologic apparatus may further include a driving unit for moving the main optical system to a predetermined position, and a control unit for controlling the driving unit. When the control unit detects the signal of the predetermined frequency component, the control unit controls the driving unit to move the main optical system to the predetermined position with respect to the subject's eye. . Thus, the ophthalmologic apparatus can immediately start adjusting the working distance of the main optical system at any time.

The ophthalmologic apparatus according to the present invention includes a main optical system,
A plurality of subject detection means for detecting whether or not the body part of the subject exists within a predetermined distance, wherein each of the subject detection means includes a light emitting element, a light receiving element, and a control unit. And the light-emitting element emits an index light that blinks at a predetermined frequency according to a signal from the control unit, and the control unit includes a signal generated in the light-receiving element by reflected light of the index light by a subject. Only the signal of the predetermined frequency component is detected, and based on which of the plurality of subject detection means has detected the signal of the predetermined frequency component, which of the left and right eyes is the subject's eye is It is characterized in that it is configured to judge.

According to the configuration provided with a plurality of subject detecting means, the position of the face of the subject can be determined by specifying the subject detecting means which has detected the signal of the predetermined frequency component. Since it is possible, it is possible to know whether the subject's eye is the left or right eye.

[0015] The ophthalmologic apparatus may further include a driving unit for moving the main optical system to a predetermined position, and a control unit for controlling the driving unit, wherein the control unit includes the plurality of subject detection units. A control unit that controls the driving unit to move the main optical system to a predetermined standby position with respect to the subject's eye when any of the control units detects the signal of the predetermined frequency component. Can be added.
Thus, the ophthalmologic apparatus can immediately start adjusting the working distance of the main optical system at any time.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an ophthalmologic apparatus according to the present invention will be described with reference to FIGS. The ophthalmologic apparatus according to the present invention projects index light blinking at a predetermined frequency on a part such as the face of the subject, and detects the presence or absence of the part of the subject by detecting the reflected light. is there. When detecting the part of the subject in this way, the index light may be projected on any part of the subject, but since the present invention relates to an ophthalmologic apparatus, the position of a part as close to the subject's eye as possible is preferably determined. Preferably, it is detected. Therefore, in the following, the position near the lower eyelid is detected.

FIG. 1 is a diagram showing a schematic configuration of an ophthalmologic photographing apparatus A1 as an embodiment of the ophthalmologic apparatus according to the present invention. A base B1 to which a photographing system is attached is movably provided on a main body frame F of the ophthalmologic photographing apparatus A1, and the photographing system includes a photographing optical system Q as a main optical system as described later. A drive device 2 as a drive means is interposed between the base B1 and the main body frame F. The drive device 2 receives a drive signal from a control circuit C1 as a control means described in the claims, and receives the drive signal from the control circuit C1.
Is moved in the XYZ axis directions with respect to the main body frame F.
Here, the X axis is an axis orthogonal to the paper surface, and the Y axis is a vertical axis. Both are orthogonal to each other in a plane orthogonal to the eye axis i of the eye E to be examined. The Z axis is an axis parallel to the eye axis i of the eye E. Further, a base position detecting device 6 is interposed between the base B1 and the main body frame F. The base position detecting device 6 detects the position of the base B1 with respect to the main body frame F and sends out a detection signal to the control circuit C1. That is, the base position detection device 6 plays a role of feeding back the movement state of the base B1 by the driving device 2 to the control circuit C1.
Thus, the control circuit C1 can accurately control the position of the base B1.

A viewing window 7 is provided below the body frame F.
The forehead 7 on which a is formed is fixed. A subject detection device 8 that outputs a detection signal when the distance to the subject's lower eyelid W is equal to or less than a predetermined value is attached below the viewing window 7a. The subject detection device 8 is a subject detection means described in the claims. As will be described later, the subject detection device 8 outputs a detection signal when the distance to the lower eyelid W of the subject is equal to or less than a predetermined value under the control of the control unit D1.

FIG. 2 is an oblique view of the forehead 7, but the subject detecting device 8 is attached to the back side of the holes 7b and 7c. The hole 7b is provided with a light emitting element 8d of the subject detection device 8 described later.
Is provided to irradiate the lower eyelid W of the subject with the index light from the subject, and the hole 7c is provided to allow the reflected light of the index light by the lower eyelid W to enter a light receiving element 8e described later. is there.

FIG. 2 is a perspective view of the forehead 7. Forehead 7
Is one of the face pads supporting the subject's head. Forehead 7
A viewing window 7a for limiting the visual field of the subject's eye E to a certain range is formed below the eye.

FIG. 3 is a block diagram of the subject detection device 8. As described above, the subject detection device 8 includes the light emitting element 8d.
And a light receiving element 8e. The subject detection apparatus 8 includes a control unit 38, and the control unit 38 includes an oscillation circuit 8f, a driver 8g, and a high-pass circuit 8h. A signal of a predetermined frequency (1 kHz in this embodiment) is output from the oscillation circuit 8f.
Is input to the driver 8g. The driver 8g causes the light emitting element 8d to emit infrared index light that blinks at the above frequency based on the input signal. The light receiving element 8e receives the light reflected by the subject irradiated with the index light by the light emission of the light emitting element 8d, and generates a signal corresponding thereto. As the light emitting element, for example, a light emitting diode can be used, and as the light receiving element, for example, a photo sensor, a CCD, or the like can be used.

The signal generated by the light receiving element 8e includes not only a signal having the same frequency component as that of the index light but also a signal generated by disturbance light from sunlight, an incandescent lamp, or the like.
The signal generated by the light emitting element 8d is input to the high-pass circuit 8h together with the signal generated by the disturbance. The high-pass circuit 8h has a function of cutting a signal of a frequency component lower than a predetermined frequency (in this embodiment, the frequency is set to the blinking frequency of the index light). Since the signal generated by the scattered light is a DC component, it cannot pass through the high-pass circuit 8h. Therefore, the high-pass circuit 8h outputs the signal only when the reflected light of the index light by the subject enters the light receiving element 8e. , A detection signal is output. High pass circuit 8
The detection signal output from h is input to the control circuit C1.

The ophthalmologic photographing apparatus A1 is configured as described above. When photographing the subject's eye E with the ophthalmologic photographing apparatus A1, the examinee first moves his / her head to the position of the viewing window 7a. Set. At this time, the indicator light blinking at a predetermined frequency is emitted from the light emitting element 8d of the subject detection device 8 provided on the forehead 7, and the face of the subject is detected by the subject detection device 8
Approaches, the index light is reflected by the lower eyelid W of the subject's face, and the reflected light is input to the light receiving element 8e. From the light receiving element 8e, a signal having the same frequency as that of the reflected light is output together with a signal due to disturbance light or the like. 8
h and is input to the control circuit C1. The subject's head is supported by bringing the forehead into contact with the forehead 7.

In this embodiment, the control circuit C1 receives the detection signal passed through the high-pass circuit 8h, emits a light source (not shown) for alignment, controls the driving device 2, and starts automatic alignment at the same time. Then, positioning is started to guide the imaging optical system Q to the standby position with respect to the eye E.

The automatic alignment is performed by driving and controlling the base B1 in the X and Y directions so that the Purkinje image falls within a predetermined range in the center of the imaging screen of the television camera 15 for imaging the anterior eye. The drive control of the base B1 is performed by the control circuit C1 receiving an image signal from the television camera 15 and transmitting a drive signal to the drive device 2 based on the image signal.

Further, as described above, when the detection signal from the high-pass circuit 8h is input to the control circuit C1, the control circuit C1 sends a drive signal to the drive device 2 and connects the photographing optical system Q to the eye E to be examined. The base B1 is moved in the Z direction so as to be located at a predetermined standby position. The base B1 is initially at a position closest to or farthest from the eye E in the movable range in the Z direction. Then, at the moment when the signal passed through the high-pass circuit 8h of the subject detection device 8 is detected by the control circuit C1, retreat or forward movement is started from this initial position and moves to the standby position.

Even after the photographing optical system Q has reached the standby position, the subject detecting device 8 continuously outputs a detection signal to the control circuit C1. Therefore, for example, when the subject moves out of front of the ophthalmologic photographing apparatus A1 by moving the head or the like, the signal from the subject detection device 8 to the control circuit C1 is interrupted, thereby causing the subject's eye to be examined. It is determined by the control circuit C1 that the camera is not in a state where it can be photographed.

After the photographing optical system Q has been set to the predetermined standby position in this way, the operator of the ophthalmologic photographing apparatus A1 informs the subject that the photographing of the eye E is to be started. Press the start button (not shown). Then, a signal of a working distance adjustment command is given to the control circuit C1, and the control circuit C1 starts normal working distance adjustment of the photographing optical system Q while continuing the automatic alignment.

The tension state in which the subject cannot blink or the like starts when the operator of the ophthalmologic photographing apparatus A1 notifies the subject that the photographing of the eye E is to be started. However, the time from when the operator presses the start button to when the photographing by the photographing optical system Q is completed can be short as described above. Therefore, it is sufficient for the subject to maintain the nervous state in a short time, and the mental burden on the subject can be reduced.

FIG. 4 is a block diagram showing a schematic configuration of an ophthalmologic photographing apparatus A2 as another embodiment of the ophthalmologic apparatus according to the present invention.
In the embodiment of FIG. 1, the subject detecting device 8 is attached to the forehead 7, but as in the ophthalmologic photographing device A2 of FIG.
It may be directly attached to. The ophthalmologic photographing apparatus A2 in FIG.
The mounting position of the subject detection device 8 is different from that of the ophthalmologic imaging apparatus A1 in FIG. 1, but the other configuration is the same as that of the ophthalmologic imaging apparatus A1 in FIG.

FIG. 5 is a block diagram showing a schematic configuration of an ophthalmologic photographing apparatus A3 as still another embodiment of the ophthalmologic apparatus according to the present invention. In the embodiment of FIG. 4, the subject detecting device 8 is fixed to the main body frame F via the forehead 7, but may be attached to the base B3 as in the ophthalmologic photographing device A3 of FIG. Good. The configuration of the subject detection device 8 of FIG.
The infrared light emitted from the light emitting element 8d at a predetermined frequency is applied to the lower eyelid W, and the reflected light of the indicator light from the lower eyelid W is received by the light receiving element 8e. I have. In the configuration of FIG. 5, when the base B3 moves, the subject detecting device 8 also moves. The ophthalmologic photographing device A3 in FIG.
Is different from the ophthalmologic photographing apparatus A1 in FIG. 1 in the mounting position of the subject detection device 8, but the rest is the ophthalmologic photographing apparatus A1 in FIG.
It is configured similarly to.

FIG. 6 is a diagram showing a use state of an ophthalmologic photographing apparatus A4 as an embodiment of the ophthalmologic apparatus according to the present invention configured as a hand-held apparatus. The ophthalmologic photographing apparatus may be configured as a stationary apparatus in which the main body frame is mounted on a desk top, a floor, or a dedicated table, or may be configured as a hand-held apparatus as shown in FIG. . The ophthalmologic photographing apparatus A4 has a handle H attached to the left and right sides of the main body frame F, and is configured as a hand-held type. The ophthalmologic photographing apparatus A4 does not include a face pad, and is fixed such that the subject detection device 8 is built in the main body frame F. Since no face contact is provided, the positional relationship between the subject's head and the apparatus main body cannot be stabilized, but the subject detection device 8 of this embodiment requires a distance to the subject's eye that changes with time. It has a function of continuously detecting and transmitting a detection signal to a control circuit in the main body frame, and the control circuit follows a temporal change of the detection signal, and the base on which the photographing optical system is mounted. Is moved, the photographing optical system is always maintained at a predetermined standby position in relation to the eye E to be inspected.

FIG. 7 is an oblique view of an ophthalmologic photographing apparatus A5 according to another embodiment of the present invention. This ophthalmologic imaging apparatus A5 has the function of detecting the body part of the subject, and furthermore, which of the left and right eyes of the subject is the subject eye, that is, which one of the eyes is photographed. It has a function of judging whether or not to perform, and has the same configuration as the ophthalmologic photographing apparatus A2 in FIG. 4 except that two subject detection devices 8 in FIG. 4 are provided. Therefore, the same reference numerals are given to the same elements corresponding to the ophthalmologic photographing apparatus A2 in FIG.

The ophthalmologic photographing apparatus A5 has a forehead 7 in front of it, and two subject detecting devices 1 are provided diagonally below left and right of the forehead 7.
8 and a subject detection device 28. These two subject detecting devices 18 and 28 detect the face of the subject by detecting the reflected light of the index light that blinks at a predetermined frequency, similarly to the subject detecting device 8 of FIG. 1 described above. In addition to detecting such a part, based on which of the subject detection devices 18 and 28 has detected the body part of the subject,
It is to determine which of the left and right eyes of the subject comes out of the subject's eye.

FIG. 8 shows two subject detecting devices 18 and 28.
It is a block diagram of. Each of these subject detection devices 18 and 28 has the same configuration as the subject detection device 8 of FIG.
8d, a light receiving element 18e, and a control unit 48. The control unit 48 includes an oscillation circuit 18f, a driver 18g,
And a high-pass circuit 18h. Similarly, the other subject detection device 28 includes a light emitting element 28d, a light receiving element 28e, and a control unit 58.
Has an oscillation circuit 18f, a driver 28g, and a high-pass circuit 28h. In this embodiment, the oscillation circuit 18f
Are shared by the control unit 48 and the control unit 58.

As in the case of FIG. 3, a signal of a predetermined frequency (1 kHz in this embodiment) is output from the oscillation circuit 18f, and a signal of the predetermined frequency from the oscillation circuit 18f is input to the drivers 18g and 28g. Is done. The drivers 18g and 28g cause the light emitting elements 18d and 28d to emit infrared index light that blinks at a frequency of 1 kHz based on the input signals. The light receiving element 18e receives light reflected by irradiating the subject with the index light generated by the light emission of the light emitting element 18d, and generates a signal corresponding thereto. Similarly, the light receiving element 28e receives the light reflected by the subject irradiated with the index light generated by the light emission of the light emitting element 28d, and generates a signal corresponding thereto.

The signals generated by the light receiving elements 18e and 28e include signals generated by disturbance light from sunlight, incandescent lamps, etc. in addition to the above-mentioned frequency component signals, and are generated by the light emitting elements 18d and 28d. The signal is input to the high-pass circuit 8h together with the signal generated by the disturbance. The high-pass circuits 18h and 28h have a function of cutting a signal of a frequency component lower than a predetermined frequency (in the present embodiment, the same frequency as the blinking frequency of the index light). Since the signal generated by the disturbance light is a DC component, it cannot pass through the high-pass circuits 18h and 28h. Therefore, the light reflected from the subject by irradiating the subject with the index light is received from the high-pass circuits 18h and 28h. A signal is output only when light is received by the elements 18e and 28e. The detection signals output from the high-pass circuits 18h and 28h are input to a control circuit (not shown) as a right-eye signal and a left-eye signal, respectively.

In the ophthalmologic photographing apparatus A5, when the subject approaches his / her right eye to the window 7a, only the light receiving element 18e of the subject detecting device 18 outputs a detection signal based on the reflected light of the index light. The signal passes through the high-pass circuit 18h and is output as a right eye signal. Similarly, the subject places his left eye in window 7a.
, Only the light receiving element 28e of the subject detection device 28 outputs a detection signal based on the reflected light of the index light,
This detection signal passes through the high-pass circuit 28h and is output as a left-eye signal. The right-eye signal or the left-eye signal is input to the control circuit, based on which the automatic alignment of the photographing optical system Q and the guidance of the photographing optical system Q to the standby position are performed as in the case of FIG. Becomes In addition, based on the right-eye signal or the left-eye signal input to the control circuit, the captured image is recorded together with information indicating whether the image is the right-eye image or the left-eye image of the subject.

In the above description, the subject detection devices 18 and 2
Although the case where 8 is directly attached to the main body frame F has been described, the present invention is not limited to this, and may be attached to, for example, a forehead 7 or may be attached to a base.

In each of the above embodiments, the blinking frequency of the light emitting element of the subject detecting apparatus is set to 1 kHz. However, the present invention is not limited to this. Can be used at any frequency. In the case where visible light is used as the index light, the frequency is preferably higher than the frequency of a fluorescent lamp used as illumination.

In this embodiment, an ophthalmologic photographing apparatus having two subject detecting devices has been described. However, the present invention is not limited to this, and more subject detecting devices are provided. It can also be configured. By increasing the number of the subject detection devices, it is possible to more accurately determine which of the right and left eyes is the subject's eye.

Although the present invention has been described with reference to the embodiments, the ophthalmic apparatus to which the present invention is applied is not limited to an apparatus for photographing corneal endothelial cells. For example, like a fundus imaging device,
The present invention is also applicable to an ophthalmologic photographing apparatus for photographing a part other than the corneal endothelium of the subject's eye. Further, the ophthalmologic apparatus to which the present invention is applied is not limited to an ophthalmologic photographing apparatus, but can be applied to any ophthalmologic apparatus that needs to move a main optical system to a predetermined position such as an operation position. For example, an auto-refractometer, photokeratometer, ophthalmometer for measuring the refraction of the eye to be examined, a synoptophore for correcting binocular vision, a haploscope for binocular vision testing, a fundus perimeter Or diopter or tonometer for anterior segment diagnosis,
It can also be applied to specular microscopes, pachymeters, Shine Fluke cameras, transillumination image analyzers, and scanning laser off-salomoscopes for fundus diagnosis.

In the case of a fundus photographing apparatus, since a large-diameter objective lens is usually located near the eye to be inspected, an optical system passing through the objective lens is used to detect the position of the eye to be inspected. Therefore, rather than employing a configuration of position detecting means for directly projecting the index light to the eye to be inspected and detecting the position of the eye to be inspected, the index light is applied to a part of the face other than the eye to be inspected as in the present invention. There is an advantage in that adopting a configuration in which the position of the portion is detected by projecting the image and indirectly detecting the position of the eye to be inspected based on the detection result reduces restrictions on design.

In the above embodiment, the forehead is used as the face, but a chin rest may be used as the face instead of the forehead.

[0045]

According to the ophthalmologic apparatus of the present invention, the subject is detected by using the reflected light of the index light which blinks at a predetermined frequency, so that the subject is not affected by disturbance light from sunlight, incandescent lamps and the like. The body part of the subject can be detected. Thereby, the ophthalmologic apparatus of the present invention can know the presence of the subject's face and the like, and can start subsequent operations.

Further, the ophthalmologic apparatus of the present invention has a plurality of subject detecting means for detecting the subject using reflected light of the index light which blinks at a predetermined frequency. By identifying whether the signal of the component is detected, it is possible to know the existence of the subject's face or the like and to determine whether the subject's eye is the left or right eye.

Further, the ophthalmologic apparatus according to the present invention is configured to move the main optical system to a predetermined standby position with respect to the subject's eye based on the detection result of the subject, so that the main optical system can be operated at any time. The adjustment of the working distance of the system can be started.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of an ophthalmologic photographing apparatus as one embodiment of an ophthalmologic apparatus according to the present invention.

FIG. 2 is a perspective view of a forehead in the embodiment of FIG. 1;

FIG. 3 is a block diagram of a subject detection device.

FIG. 4 is a configuration diagram illustrating a schematic configuration of an ophthalmologic photographing apparatus as still another embodiment of the ophthalmologic apparatus according to the present application.

FIG. 5 is a configuration diagram showing a schematic configuration of an ophthalmologic photographing apparatus as still another embodiment of the ophthalmologic apparatus according to the present application.

FIG. 6 is a diagram illustrating a usage state of an ophthalmologic photographing apparatus as an example of the ophthalmologic apparatus according to the present application configured as a hand-held apparatus.

FIG. 7 is an oblique view of an ophthalmologic photographing apparatus according to another embodiment of the present invention.

FIG. 8 is a block diagram of the two subject detection devices of FIG. 7;

[Description of Signs] A1, A2, A3, A4, A5 Ophthalmic imaging apparatus B1, B2, B3 Base C1, C2, C3 Control circuit D1, D2, D3 Control unit 2 Drive unit 6 Base position detection device 7 Forehead 7a window 7b, 7c hole 8, 18, 28 subject detecting device 8d, 18d, 28d light emitting element 8e, 18e, 28e light receiving element 8f, 18f oscillation circuit 8g, 18g, 28g driver 8h, 18h, 28h high-pass circuit 15 television Camera 38, 48, 58 Control unit

Claims (4)

[Claims] 1. An ophthalmologic apparatus comprising: a main optical system; and subject detection means for detecting whether a body part of a subject exists within a predetermined distance. The person detecting means has a light emitting element, a light receiving element, and a control unit, and the light emitting element emits an index light that blinks at a predetermined frequency according to a signal from the control unit, and the control unit controls the subject of the index light. An ophthalmologic apparatus that detects only a signal of the component of the predetermined frequency among signals generated in the light receiving element due to light reflected by the light receiving element. 2. The ophthalmologic apparatus further includes a driving unit that moves the main optical system to a predetermined position, and a control unit that controls the driving unit. 2. The ophthalmologic apparatus according to claim 1, wherein when the control unit detects a signal of the predetermined frequency component, the driving unit controls the main optical system to move the main optical system to the predetermined position with respect to the subject's eye. . 3. A subject optical system comprising: a main optical system; and a plurality of subject detecting means for detecting whether a body part of the subject exists within a predetermined distance. Has a light-emitting element, a light-receiving element, and a control unit, the light-emitting element emits an index light that blinks at a predetermined frequency according to a signal from the control unit, and the control unit reflects the index light reflected by the subject. By detecting only the signal of the component of the predetermined frequency among the signals generated in the light receiving element, the eye to be inspected is determined based on which of the plurality of subject detection means has detected the signal of the predetermined frequency component. An ophthalmologic apparatus configured to determine which of the left and right eyes is. 4. The ophthalmologic apparatus further includes a driving unit that moves the main optical system to a predetermined position, and a control unit that controls the driving unit, wherein the control unit includes the plurality of subject detection units. And controlling the driving means to move the main optical system to the predetermined position with respect to the subject's eye when any one of the control units detects the signal of the predetermined frequency component. 3. The ophthalmic apparatus according to 3.