JPH0779918A - Ophthalmologic optical apparatus with pre-setting device - Google Patents

Abstract

PURPOSE:To offer an effective means which has such an advantage as allowing an observation of eyeballs, etc., by an optical head in a short time, by equipping an ophthalmologic optical apparatus with a pre-setting device to moves the optical head beforehand to a position near the measurement position for optometry, etc., automatically prior to the observation. CONSTITUTION:The apparatus is so structured that the optical head 3 is driven from its regular position before observation to a position near the eyeball of the subject automatically and, when the observation is completed, returned to its regular position again automatically, with an up and down driving mechanism and a horizontal driving mechanism of the optical head 3 enabling to drive or stop the optical head 3, and by means of a stopping mechanism equipped in the jaw rest 11 and, in addition, an electric control circuit to control those mechanisms, working altogether.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mounts a presetting device for bringing an optical unit head close to a position suitable for observing an eyeball to an optical device for ophthalmology to automatically and automatically perform optical observation before observing the eyeball. The optical head is driven to a height where the eyeball of the subject can be captured within the narrow field of view of the optical device provided in the optical head, and the optical head is positioned so that the focus of the optical device is close to the eyeball. It is intended to provide an ophthalmic optical device with a preset device, which has a configuration in which the optical unit head automatically returns to a fixed position before observation while driving the camera.

[0002]

2. Description of the Related Art Conventionally, an optical system of an optical head is moved by moving an optical head at a position away from an eyeball by operating only a manual or electric vertical moving device and a horizontal moving device. The work of capturing the eyeball of the subject in the narrow visual field of the device is performed, and the work of focusing with the eyeball is also performed from the state outside the depth of focus.

[0003]

Conventionally, an examiner brings an optical unit head close to an eyeball in a narrow field of view of an optical system device while facing an examinee with an ophthalmic optical device interposed therebetween. The operation of focusing was forced. Therefore, there has been a problem that much of the time required for observing the eyeball is spent for the operation for this purpose. This is a burden on both the inspector and the subject. Therefore, the present invention is to install a preset device for automatically approaching the optical head to a position suitable for observing the eyeball prior to observing the eyeball or the like, by attaching the preset device to a conventional ophthalmic optical device. The above problem is solved by driving the eyeball to a position where the eyeball can be seen in the narrow field of view of the optical system device, and the focus of the optical system device is substantially aligned with the eyeball, and stopping at that position.

[0004]

Therefore, the present invention comprises, therefore, an optical unit head, a gantry, and a pedestal including a chin rest and a chin rest, and a vertical movement unit for moving and stopping the optic head. A conventional manual or electric ophthalmic optical device including a moving device and a horizontal moving device is provided with a presetting device having the following configuration. A vertical drive mechanism and a horizontal drive mechanism for the optical unit head are provided with a preset device that enables the optical unit head to reciprocally drive and stop, and automatically drives the optical unit head to a position near the optometry position. . A stop mechanism was provided on the chin rest. It is composed of a start-up switch, the vertical drive mechanism, the horizontal drive mechanism, the stop mechanism, a control electric circuit interconnecting these, and a marker attached to the forehead frame for the subject. Equipped with a control mechanism.

[0005]

The operation of the device of the present invention will be described with reference to the drawings.
In FIG. 1, the optical head 3 is in a fixed position before the start of observation.
It is explanatory drawing which shows the side surface external appearance of the ophthalmic optical device with a preset device of this invention, and the position of the cornea surface C of a subject, and its vertex T. FIG. 2 is an explanatory diagram showing a state immediately before observation, in which the start-up switch 1 of the present invention is turned on, the preset device is operated, and the optical head 3 is driven and stopped. In FIG. 1, the subject places his or her chin on the chin rest 11 and the height of the eyeball E is
The state where the heights of the markers 2 attached to the forehead support frame 6 for the subject are matched is shown. At this time, the optical axis N1 of the eyeball E, that is, the height of the virtual normal line passing through the apex T of the convex mirror-like corneal surface C is different from the height of the optical axis N2 of the optical device objective lens 7 of the optical head 3. There is. Further, the focus of the objective lens 7 shown by F in the drawing is away from the apex T of the corneal surface C.

In this state, the start switch 1 is turned on,
When the preset device of the present invention is operated, the vertical drive mechanism starts to drive and pushes up the optical unit head 3, and when the optical axis N2 of the optical device objective lens 7 of the optical unit head 3 matches the height of the marker 2. Then, the stop mechanism of the vertical drive mechanism operates, the control electric circuit having the relay stops the vertical drive mechanism, and the optical head 3 stops at the position of the height. At the same time, when the horizontal drive mechanism starts driving and the optical head 3 moves straight to the left in the figure and reaches a preset position, the stop mechanism of the horizontal drive mechanism operates, and similarly,
The optical unit head 3 stops at that position. At this time, in FIG. 2, the optical axis N1 of the eyeball E and the height of the optical axis N2 of the optical device objective lens 7 are substantially coincident with each other, and the anterior ocular segment of the subject's eye is captured in the visual field.

However, for the observation, precise positioning and focusing are required. Here, the starting switch 1 is turned off to suspend the operation of the presetting device. However, a braking action is applied to the vertical and horizontal drive mechanisms. Next, the vertical movement device is operated by manual operation to finely adjust the height of the optical unit head 3 so that the optical axis N2 of the optical device objective lens 7 and the optical axis N1 of the eyeball E coincide with each other. . Similarly, the horizontal movement device is operated by a manual operation, and the gantry 4 is finely adjusted to the left and right in the drawing so that the focus F of the optical device objective lens 7 coincides with the apex T of the corneal surface C.

After the observation is completed, when the subject is separated from the chin rest 11, due to the action of the stop mechanism attached to the chin rest 11 and the control electric circuit, the driving of the vertical drive mechanism and the horizontal drive mechanism is reversed. As a result, the optical unit head 3 returns to the position shown in FIG.
At the same time, the operation of the preset device of the present invention ends there.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 is a front view of an ophthalmic optical device with a presetting device according to the present invention as viewed from the inspector side. The gantry 4 is horizontally movably mounted on the base 5, and the optics head 3
Are supported by the gantry 4. An optical table 13 including a power supply unit supports the whole. In the figure, 1 is a start-up switch of the presetting device, and 2 is a mark attached to the forehead frame 6 for the examinee. 8 in the figure
Is a joystick for horizontal movement device, and 9 in the figure is
A vertical fine movement ring of the vertical movement device, and M is a monitor screen for observation. FIG. 4 is a rear view of the ophthalmic optical device with the preset device according to the present invention as viewed from the subject side. 1 in the figure
Reference numeral 1 is a chin rest, inside which a stop mechanism is configured. Forehead rests 14 are located at approximately the center of the top line of the forehead rest frame 6 for the examinee. In this embodiment, there are three objective lenses for observing the eyeball in the approximate center of the optical head 3, and the objective lens 15 at the center is an objective lens for focusing. FIG. 5 is a side view of an ophthalmic optical device with a preset device of the present invention. The forehead rest 14 is shown slightly to the right in the figure, so that the subject whose chin is placed on the chin rest 11 can easily stabilize his / her face.

FIG. 6 is a side sectional view of an ophthalmic optical device with a preset device according to the present invention in which the optical head 13 is broken. The vertical movement device first starts inside the gantry 4 with a gear 16 meshed with a gear 9B on the outer periphery of the lower end of the vertical fine movement ring 9, and is connected to a gear group 17 arranged in the left direction in the drawing to form a universal joint. The rotary shaft 20 is connected to the bearing 21 by a universal joint 19B. The rotary shaft 20 is rotatably supported by the universal joint 19B. It is configured by being connected to the male screw 20A.

A female screw 23, which is a part of the vertical drive mechanism of the present invention, is screwed onto the male screw 20A. The female screw 23 is a ball bearing 22 provided on the outer periphery of the upper end thereof.
Is in contact with the lower surface of the lift plate 21 and
The gear 23A on the outer periphery of the lower end meshes with the drive gear 24A of the drive motor 24 shown in FIG.

At the center of the lift plate 21, there is formed a support shaft 27 having a shock absorbing portion 28 using a spring as a shock absorbing material, and a slide table 25 is provided so as to cover the upper surface thereof.
Are attached to the upper surface of the lift plate 21. A horizontal drive plate 29, which is a part of the horizontal drive device of the present invention.
Is formed on the lower surface of the pedestal plate 26 of the optical unit head 3. The horizontal drive plate 29 is carried by a slide base 25 so as to be slidable left and right in the figure. FIG. 7 shows the slide table 25 and the horizontal drive plane.
It is a front cross-sectional view showing a slide portion with a door 29. The horizontal drive plate 29 is provided with guide guides 29A having a rectangular cross section in parallel with the side ends near both ends of the lower surface. A support guide 25A having a rectangular cross section with a partial right-angled defect of the slide table 25 supports the guide guide 29A, and between the support guide 25A and both end surfaces on which the guide guide 29A slides, Ball bearings 25B are arranged.

In FIG. 6, at one end of the upper surface of the base 5, a slide plate 30 constituting a horizontal moving device is provided with a joystick 8
It is provided at a position where it abuts the hemispherical rubbing sphere 38 at the lower end of the. Two rack gears 32 arranged in parallel with each other are installed on the upper surface of the recess 31 at the other end of the base 5. A pinion gear 33 having a cylindrical guide 37 meshes with the rack gear 32. FIG. 8 is a partial cross-sectional top view showing the above-mentioned portion of the horizontal movement device. The cylindrical guide 37 pivotally supports the bearing receiving portion 35 of the slide shaft 36 by the bearing 34, and the slide shaft 36 is provided with support plates A1 and A2 at both ends thereof. The gantry 4 includes support plates A1 and A2.
And a contact surface between the rubbing sphere 38 and the rubbing plate 30 are supported by three points and are mounted on the base 5.

FIG. 9 is a front sectional view in which the optical head 3 is broken. The drive motor 24 of the vertical drive mechanism is vertically attached to the lower surface of the lift plate 21, and the reduction gear 24B.
And a drive gear 24A, and the drive gear 24A is a female screw 23.
The gear 23A is meshed with the outer periphery of the lower end of the. The vertical drive mechanism includes, in addition to the drive motor 24 and the female screw 23, although not shown, a contact type control switch attached to the inner surface of the outer box of the gantry 4, a lower portion of the lift plate 21, and a drive motor. In the vicinity of the switch 24, the stop mechanism is composed of a contact-type control switch attached to a support member that interlocks with the set height of the marker 2.

Reference numeral 30 in FIG. 9 is a drive motor of a horizontal drive unit attached to a vertical side surface 21B formed on the end surface of the lift plate 21. The reduction gear of the drive motor 30 and the male screw directly connected to the reduction gear are provided vertically downward along the side surface 21B in FIG. 9 (not shown).
The male screw is screwed with a female screw attached to the end surface of the horizontal drive plate 29 (not shown). The horizontal drive mechanism
In addition to the above mechanism, although not shown, the horizontal drive plate 2
9 and a lift control plate 21 and a contact control switch attached to the lift plate 21.

FIG. 10 is a front sectional view of an embodiment of a pressure-sensitive control switch S, which is one of the stopping mechanisms of the essential part of the present invention, which is provided in the slide portion 11A between the chin rest 11 and the chin rest 12. . A molded product 32A of an insulating material including a molded product 34A of a conductive material is attached to the lower surface of the chin rest 11, and a molded product of a conductive material having the cross section shown in the drawing is attached to the upper surface of the chin rest 12. A molded article 32B of insulating material with 34B is attached. The chin rest 11 and the chin rest 12 are both slide parts 1
It is slidable at 1A, and pressure adjustment spring 31
Thus, as shown in the figure, the conductive material molded product 34A and the conductive material molded product 34B are in equilibrium in a separated state. Further, reference numeral 33 in the figure denotes a terminal connected to a control electric circuit (not shown). In addition to the present embodiment, the pressure-sensitive control switch that uses fluid pressure or the like can be easily implemented.

When the subject places his or her chin on the chin rest 11, FIG.
Medium, pressure-sensitive control switch S conductive material moldings 34A and 3
4B comes into contact, and the presetting device of the present invention is ready for activation. The inspector operates the chin rest upper and lower handles 10, and the marker 2
To the eye level of the subject. Therefore, when the start switch is turned on, the drive motor 24 of the vertical drive mechanism rotates in the normal direction, the gear 24A transmits the rotation to the gear 23A of the internal thread 23, and the internal thread 23 rotates in the normal direction. While the ball bearing 22 at the top is rotating,
Push up G. 21. As a result, the lift plate 21
The slide table 25 attached to the table, the horizontal drive plate 29 carried by the slide table 25, and the pedestal plate 2 of the optical head 3.
6 are pushed up together. When the height of the observation objective lens 15 of the optical head 3 coincides with the height of the marker 2, the two contact control switches of the vertical drive mechanism come into contact with each other and the control electric circuit operates. The drive motor 24 is stopped, and a braking voltage is applied to the drive motor 24. A support shaft 27 formed in the central portion of the lift plate 21 and the buffer portion 2
8 absorbs the load of the optical unit head 3 and the load caused by the displacement of the load center due to the movement of the position.

At the same time, the side end surface 21 of the lift plate 21 is
The drive motor 30 of the horizontal drive mechanism attached to B rotates in the forward direction, and its rotational movement is transmitted to the female screw attached to the side surface of the horizontal drive plate 29 as in the above case. The optical head 3 is driven leftward in FIG. When the contact control switch attached to the horizontal drive plate 29 comes into contact with the contact control switch attached to the lift plate 21, the drive electric motor 30 is stopped by the operation of the control electric circuit, A braking voltage is applied to the drive motor 30. Drive mode
When the motor 24 and the drive motor 30 are stopped, the monitor screen M in FIG.
An image of the anterior segment of the subject is projected. In this embodiment,
The horizontal drive plate 29 is set so that the control switch comes into contact with the horizontal drive plate 29 when it is moved to the left in the figure by about 10 mm from the fixed position before the start of observation. This is for avoiding a feeling of pressure on the subject by keeping the optical head away from the subject as much as possible before activating the preset device.

Here, the start-up switch 1 is turned off, and the operation of the preset device is suspended. However, the braking voltage acts on the drive motors 24 and 30.

Since human eyes have individual differences in their appearances,
At the drive stop position of the optical unit head 3 by the presetting device, it is often not suitable for observing the eyeball immediately. Therefore, fine adjustment is performed by operating the vertical fine movement ring 9 and the joystick 8. By rotating the vertical fine movement ring 9, it is transmitted from the lower end outer peripheral gear 9B through the gear 16 and the gear group 17 to the gear 18 that supports the rotation shaft 20. The rotation of the rotation shaft 20 is the rotation of the male screw 22. At this time, since the driving motor 24 is applied with the braking voltage, the female screw 23 does not rotate, but the rotation of the male screw 22 causes the bearing 22 to rotate while moving the plate 21 up and down. Move slightly. Thereby, the height of the observation objective lens 15 is finely adjusted up and down, and the height of the optical axis N2 thereof is matched with the height of the optical axis N1 of the eyeball E. Next, when the joystick 8 is slid like a slat, the above-mentioned sliding is transmitted by the fulcrum P to the contact surface between the sliding sphere 38 and the sliding plate 30 of the base 5. The action of this sliding is performed through the frame material (not shown) of the pedestal 4 and the base 5
It is transmitted to the support plates A1 and A2 of the gantry 4 installed at.
By this action, a vector force acting in two directions is generated in the rack gear 32 of the base 5 in the left-right direction in FIG. 6 and in the slide shaft 36 in the vertical direction in the figure. The pedestal 4 is horizontally moved on the base 5 by the slid-like sliding operation of the joystick 8, finely adjusting the focus on the eyeball E and the optical axis alignment in the horizontal direction, and preparing for observation. Complete.

After the observation is completed, when the subject separates from the chin rest 11, the conductive material moldings 34A and 34B of the pressure-sensitive control switch S separate from each other, whereby the drive motors 24 and 30 are separated.
Causes reverse rotation, returns to the position before observation and stops, and at the same time, the operation of the preset device ends.

In this embodiment, a specular microscope for observing corneal endothelial cells is equipped with a presetting device. In addition, this presetting device is used for an optical part for diopter examination and fundus examination. It can be mounted on an ophthalmic optical measuring device equipped with a head, and it is easy to implement the configuration of the new ophthalmic optical measuring device with a preset device.

[0023]

EFFECTS OF THE INVENTION The present invention, the ophthalmic optical measuring device with a presetting device, observes the eyeball, which is becoming more and more universal due to the spread of contact lenses, the progress of eye surgery, and the improvement of the medical system. In such cases, it has an effect of providing a powerful means for improving the operability.

[Brief description of drawings]

FIG. 1 is an explanatory view of the action of an ophthalmic optical measuring device with a presetting device of the present invention.

FIG. 2 is an explanatory view of the action of the ophthalmic optical measuring device with the presetting device of the present invention.

FIG. 3 is a front view showing the whole of an ophthalmic optical measuring device with a presetting device according to the present invention viewed from the inspector side.

FIG. 4 is a back view showing the whole of the ophthalmic optical measuring device with a presetting device according to the present invention as seen from the subject side.

FIG. 5 is a side view showing the entire side surface of an ophthalmic optical measuring device with a presetting device of the present invention.

FIG. 6 is a side cross-sectional view showing a cross section of the side of the optical unit head of the ophthalmic optical measuring device with the presetting device of the present invention, which is cut away.

FIG. 7 is a front sectional view showing a slide portion of a slide base and a horizontal drive plate of the horizontal drive mechanism.

FIG. 8 is a partial cross-sectional top view showing a horizontal moving device installed on a base.

FIG. 9 is a front cross-sectional view showing a front cross-section of the optical unit head of the ophthalmic optical measurement device with a preset device of the present invention.

FIG. 10 is a front sectional view of a pressure-sensitive control switch mounted on the chin rest of an optical ophthalmic measurement device with a preset device of the present invention.

[Explanation of symbols]

 1 Start-up switch 2 Marking 3 Optical part head 4 Frame 5 Base 11 Jaw stand 21 Lift plate 23 Female screw of vertical drive mechanism 24 Motor of vertical drive mechanism 25 Slide table of horizontal drive mechanism 29 Horizontal drive plate 30 Horizontal drive mechanism drive motor S Pressure-sensitive control switch

Claims (3)

[Claims] 1. An optical unit head, a gantry, and a base having a chin rest and a chin mount, wherein a vertical drive mechanism for the optical unit head and a horizontal drive mechanism reciprocally drive the optical unit head. An ophthalmic optical device with a presetting device, which is provided with a presetting device that enables stop and automatically drives to a position near the optometry measurement position of the optical head. 2. The ophthalmic optical device with a preset device according to claim 1, wherein the jaw base is provided with a stop mechanism. 3. A start switch, the vertical drive mechanism, the horizontal drive mechanism, the stop mechanism, a control electric circuit interconnecting them, and a marker attached to the forehead frame for the subject. A control mechanism comprising:
An ophthalmic optical device with a preset device according to.