JPS6354145A - Highly accurate eyeball motion measuring apparatus - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application J The present invention relates to a one-elbow ball positive movement measurement device that measures eyeball interlocking with high precision. The present invention relates to an eyeball movement measuring device suitable for measuring the interlocking of eyeballs in a measuring device, measuring the gaze direction of a car driver, or the second F side of the line of sight in psychological experiments.

[Conventional technology] This is a conventionally known eyeball-linked measurement device.

(a) A method using corneal reflected light; ”Shiru).

However, all of these methods depend on individual differences in the curvature of the optical/refractive surface such as the cornea at the measurement limit, and it is difficult in principle to remove these individual differences and perform high-precision measurements. be.

[Seven problems to be solved by the invention] The purpose of the present invention is to not only eliminate the influence of the radius of curvature of the cornea, which differs in each individual, but also to eliminate the influence of the movement of the eyeball. It is an object of the present invention to provide an eyeball interlocking measurement device that eliminates the above problems and enables baseball interlocking to be performed at a constant rate of 41 with high precision.

[Means for Solving the Problems] In order to achieve the above object, the eyeball movement measuring device of the present invention uses a rotating mirror that can always illuminate the eyeball from the W plane regardless of its orientation, and a zero position method. 411 A controller is provided to control the rotation angle of the rotating mirror so as to maintain the light spot of the corneal reflected light at the origin of the monitor ball set on the optical axis of the constant light, and this controller or the controller controls the measurement. The rotating mirror is controlled (zero position method) so that the entire light point of the corneal reflected light is maintained at the origin of the monitor installed at the light beam @L, and the deflection angle of the rotating mirror is determined to perform such control. The rotation angle of the eyeball is measured using

[Example] The present invention is based on a patent application filed in 1980-14 previously proposed by the present inventors.
No. 6227 (Title of invention: "Eyeball refractive power measuring device")
Although the tracking speed and measurement resolution of the eye movement tracking unit are increased, it is of course not limited to the measurement of eye f movement in the eye refractive power measuring device.
This figure shows a case in which measurements of various eye movements are attached. In the figure, 1 is the subject's eyeball to be measured, and 2 is a reference point set at a specific position on the subject's head, which will be described in detail below. This is to maintain the position of the measuring instrument and the eyeball in a constant relationship and to compensate for the parallel movement of the eyeball.

The light source/receiver constant device 4 used for measuring the eyeball refractive power is as follows:
It irradiates the eyeball l with a beam-shaped infrared light pulse and receives the reflected light from the fundus, and the light source and light reception measuring device 4 and the dichroic mirror 5 disposed in front of the eyeball l are connected. In between, from the side of the light source and light receiving measuring device 4, sequentially.

A beam splitter 7, an optical system having a pair of lenses 8.8, a rotating mirror 10, a spherical mirror 11, a rotating mirror 12 whose tilting is controlled together with the rotating mirror 10, and a spherical mirror 13 opposite to the spherical mirror 11. The dichroic mirror 5, which is disposed in front of the eyeball 1, allows visible light to pass through but reflects infrared light. Therefore, the infrared light from the light source and light receiving measuring device 4 passes through the relay optical system consisting of the above lens and each mirror to the eyeball 1.
This means that the real image of the eyeball is the lens 8.
It is nothing other than that it is made on the side of the light source and light receiving measuring device 4.

Therefore, the rotating mirror 10.12 is rotated 2 times according to the movement of the eyeball.
By tilting the eyeball a certain amount around the axis or either axis, the real image of the eyeball created by the relay optical system can be kept in a static state regardless of changes in the orientation of the eyeball. The information input/output device 16, which is always visible through the dichroic mirror 15 behind it, is used as an index when measuring the refractive power of the eyeball, and also measures the light reflected by the dichroic mirror 15. An image sensor (PSD:Po5ition 5ensitiv) for position correction IL of the eyeball L arranged in the direction S
This is realized by an e llitector or a CCD. ) 18 is the group fixed to the head? This is for measuring ili ton 2 and maintaining the position of the refractive power measuring device and the eyeball in a constant relationship. Further, on the optical axis split by the beam splitter 7, that is, on the optical axis optically coaxial with the measurement light, a monitor 20 constituted by a PSD or a CCD is arranged. This monitor 20
The rotating mirror 10.12 is arranged so that the reflected light spot of the eyeball is always kept at the origin of both sides 21 of the monitor by the zero position method.
A control bed with a swinging drive mechanism (not shown) is shown;
The image sensor 18 is controlled to maintain the reference point 2 at the origin (zero position method).

However, if the subject's head is fixed using a tooth mold or the like, the position adjustment function can be omitted.

The eyeball refractive power measuring device having such a configuration uses a base fixed to the head using an image sensor 8 for one-position correction. Fi
2, thereby maintaining the position of the refractive power measuring device and the eyeball in a constant relationship to compensate for the parallel movement of the eyeball, and in this state, detecting a change in the orientation of the eyeball 1 on the monitor 20, Rotating mirrors 10 and 12 are tilted in accordance with the output, and 14 modulates and emits infrared light converged into a beam in a pulsed manner in the direction of the eyeball l, and receives reflected light from the fundus of the eye. When measuring the refractive power, a rotating mirror 1 is placed so that the reflected light point of eye #1 always maintains the origin of the monitor using a monitor 20 placed on the optical axis of the measurement light.
0.12 is controlled. That is, in the monitor 20, control is performed to maintain the reflected light spot at the origin of the monitor using the standard method. By this method, pso or C
Highly accurate control is possible without being affected by nonlinearity on a monitor screen such as an OD. In addition, by adopting the zero position method, it is possible to eliminate the influence of the radius of curvature of the cornea, which differs for each individual, which was a problem with the conventional eye movement method. It also becomes possible to measure the absolute rotation angle from the reference point using the eye or the like. Further, FIG. 2 shows a block diagram of a controller that controls the swinging drive mechanism of the rotary mirror 10.12 in the eye movement measuring device using the zero position method. That is, due to the rotation θe of the eyeball, the optical change of the corneal reflected light is as follows:
It is output as the hand and heart position on the screen. In the controller, an I-PD control system is constructed using the output of the monitor 20 and the deviation signal of the gal/heno attached to the rotating mirror 10.12.

Here, since the difference between the output of the monitor 20 and the set value is directly input to the integrator, the output of the monitor 20 will match the set value as long as the control system is stable. I! l] The angle θ of the galvano is determined so that the corneal reflected light always reaches a specified position on the monitor 20, and as a result, the rotation angle of the eye can be measured with high precision.

[Effects of the Invention] According to the eye movement measuring device of the present invention, when measuring eye movement, it is not only possible to eliminate the influence of the radius of curvature of the cornea, which differs for each individual, but also to eliminate the effects of nonlinearity on the monitor screen. It is not affected by gender, etc., and further eliminates the influence of parallel movement of the eyeball, making it possible to measure eyeball pressure movements with high precision.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the overall configuration of an embodiment of the present invention, and FIG. 2 is a block diagram of a controller for controlling a rotating mirror in the above embodiment. 1 ・Hiho, 2 ・To the base of φ, 4 ・Designated representative of Yutakane Aiko measuring device

Claims (1)

[Claims] 1. A rotating mirror that can always illuminate the eyeball from the front regardless of its orientation, and the above-mentioned mirror that uses the zero position method to maintain the light point of the corneal reflected light at the origin on the monitor installed on the optical axis of the measurement light. 1. A high-precision eyeball movement measuring device, comprising: a controller for controlling the rotation angle of a rotating mirror; and the rotation angle of an eyeball can be measured using the deflection angle of the rotating mirror output from the controller.