JPS60122541A - Upper eyelid detecting method and apparatus - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and device for detecting upper eyelid movement, and more specifically to a method and device for detecting only vertical movement of the upper eyelid.

The up and down movement of the upper eyelids indicates the conduction of the human body, similar to sensations such as pain and itching! 1! For example, many people experience a feeling of heaviness in their upper eyelids when they become sleepy, and the activity of the facial nerves that controls the movement of the eyelids accompanies natural sleep. Not only does it very accurately reflect a decline in arousal level, but it also sensitively reflects various nervous system disorders, drug effects, and even the state of self-direction disorders in the brain stem. In other words, it is extremely effective as a means of detecting prodromal symptoms of disease, and for this purpose, the movement of the eyelids and their movement speed have been measured in the past.For example, the orbicularis oculi muscle , a method of measuring the myoelectric potential of the upper eyelid plate using surface electrodes, and an electric nystagmometer (ENG).
Measurement was carried out by

In the above measurement method, corneal and retinal potentials generated from eye movements synchronized with upper eyelid movements, as well as myoelectric potentials generated from various facial muscles, are observed in a convoluted manner. It was very difficult to measure just that. Therefore, even though the prodromal symptoms of the disease are expressed in the movement of the upper eyelids, the reliability of this method as a disease test is low because the movement cannot be detected accurately.

Therefore, this invention aims to be able to purely detect only the vertical movement of the upper eyelid, and by providing a magnetic field that changes relative to the vertical movement of the upper eyelid, and detecting the magnetic field fluctuation, the upper eyelid can be detected. This feature is characterized in that it is configured to detect the movement of.

Next, the method and apparatus for detecting upper eyelid movement of the present invention will be explained with reference to the drawings and embodiments.

First, FIG. 1 is a perspective view of the entire detection device, and is designated by reference numeral 1.
0 indicates a glasses-shaped frame, and a silver bar 11 that can be placed in front of both eyes has a hook I-1 on both sides for applying mG:J to the earlobe.
magnetically sensitive elements 21, 22, 23, 24, 2 along the upper edge 11a and lower edge 1111 of the left and right silver bars 11, respectively.
5, 213 are arranged symmetrically (in particular, the positions of the magnetically sensitive elements 21 and 22 will be described later), 2r: At the center of the right silver bar 11 is a cross-shaped cursor, the so-called marker 21. The lead wires derived from each magnetically sensitive element extend to left and right amplifier circuits 30L and 30R of the left and right independent preamplifier 3o.

Furthermore, the outputs of the amplifier circuits 30L and 30R are supplied to a ring shape correction circuit 1131, and this output is amplified by a buffer amplifier 32 to drive a pen recorder 33 and a peak display meter 34.

Operating power is supplied to the magnetically sensitive elements 21 to 26 from a bias DC stabilized power supply 2B.

In addition, a magnetic chip 40 as a magnetic field generation source fixed to the upper eyelid is prepared, and this is attached to the frame 1o.
4i - When worn on the face, follow the marker 27 on the upper eyelid 1
It is pasted on 〈. This magnet chip 40 is polarized in the length direction, and the magnetically sensitive elements 21 and 22 are placed in a plane including the center of the magnet chip 40 and perpendicular to the polarization direction.

Next, actual detection by the method and device of the present invention will be explained. At a3 in FIG. 3, the strength of the magnetic field applied to the magnetically sensitive element 21 by the dipole moment magnet chip 40 is given by the following equation.

H=I/4πμ0 "13 = 1m/4πμo (d2 + (J!-X)2)2 Moreover, the magnetic field intensity given to the magnetically sensitive element 22 is expressed by the following formula.

1-1 = I/4πμor rl ' -1/4πμ0(d2+(Jl+χ)2)2 Taking the difference between the voltages Vx and Vt that are proportional to the magnetic field strength of both, and showing the displacement of the upper eyelid as a function of χ, The characteristic curve in Figure 4 is drawn,
For minute displacements of the eyelids near χ=0, a line-shaped output can be obtained.

The magnetically sensitive elements 23 to 2G are magnetically sensitive elements for correction, and are used to ensure stable output even when the magnet chip 40 is misaligned from side to side. 1+", even numbers as "-", linear correction calculation 5
By adding it to ll131, it is possible to expect an expansion of the output linear region with respect to the change χ of the upper eyelid.

h. Among the magnetically sensitive elements, if the number of correction magnetically sensitive elements is increased, it is possible to accurately correct the positional deviation of the magnet chip 40 in the left and right direction, and the stability and linearity are also improved.

In the above embodiment, a magnetic field g! is applied to the upper eyelid. However, the same effect can be achieved by attaching a magnetically sensitive element to the upper eyelid and attaching a magnet to the frame.

As is clear from the above description, this invention is applicable to the above.

Since it detects relative fluctuations in magnetic field strength due to the vertical movement of the eyelids, it is possible to accurately read the movement of the upper eyelids, contributing to the discovery of various prodromal symptoms of diseases.

[Brief explanation of the drawing]

The accompanying drawings show a method for detecting upper eyelid movement and an embodiment of the device according to the present invention, with FIG. 1 being a perspective view of the entire device, FIG. 2 being a block diagram thereof, and FIG. 3 being an explanation explaining the operation. 4 is an output scale diagram, and FIG. 5 is a diagram showing the movement of one eyelid of a normal person. 10... Frame body, 11... Silver bar, 12... Vine, 2
1 to 26...Magnetic sensitive element, 27...Marker, 30.
...Preamplifier, 30L, 3OR...amplifier circuit, 31...linear correction computing unit, 32...buffer amplifier, 33...pen recorder, 40...magnetic chip. clothes r 21τ mouth nii moxibustion mouth no f

Claims (1)

[Claims] (1) By forming a magnetic field that moves relative to the upper eyelid (up and down movement of the upper eyelid) between the upper eyelid and a position close to the upper eyelid, and detecting the overlapping of the magnetic field, the upper eyelid A method for detecting upper eyelid movement characterized by detecting vertical movement.Q) A magnetic field generation source and a magnetically sensitive element are selectively attached to the upper eyelid and a frame that can be positioned near the upper eyelid, 1. A detection device for upper eyelid movement, comprising: a display unit for displaying changes in a magnetic field.