JPS60220417A - Code input device - Google Patents

Abstract

PURPOSE:To feed a character and a mark with no use of hand and finger by providing a character/mark plate and a device which measures the movements of human eyeballs gazing steadily the desired character on said plate. CONSTITUTION:The 1st eyeball 1b gazes steadily a character/mark plate 7', and the 2nd eyeball 1a which moves in response to the movement of the eyeball 1b is illuminated by a light source 3 via a half mirror 2. The reflected light sent from the eyeball 1a is detected by a 2-dimensional position detector 5 via a lens 4. The position data outputted from the detector 5 is supplied to an arithmetic processing part 8 via a foot switch 10. Then the position data is coded and outputted from the part 8.

Description

[Detailed description of the invention] The present invention relates to a code input device.

[Prior art]

Conventional code input devices include keyboards, etc.
Since these operations are mainly performed using only human hands, there is a drawback that persons with hand disabilities cannot operate the code input device.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a corded manual device that can be used even by people with limited mobility.

[Structure of the invention]

A code input device according to the present invention includes a character symbol board that is gazed at by a first eyeball, a light source that illuminates a second eyeball that moves in conjunction with the first eyeball via a half mirror, and a light source that illuminates a second eyeball that moves in conjunction with the first eyeball; a two-dimensional position detector that receives reflected light from the eyeball through a lens and outputs position data; a 7-way switch that outputs the position data when pressed; and a code that outputs position data when output from the foot switch. and an arithmetic processing section that outputs a code signal.

[Explanation of Examples]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram containing one embodiment of the present invention.

The code input device shown in FIG.
, a condensing lens 4, a semiconductor two-dimensional position detector 5, a character symbol board 7, an arithmetic processing section 8, and a foot switch IO.

FIG. 2 is a perspective view showing an example of how the embodiment shown in FIG. 1 is used.

These devices are capable of irradiating light from a light source 3 through a half mirror 2 to the cornea of the eyeball 1a and detecting this as position data a on a semiconductor two-dimensional position detector 5 through a condenser lens 4. After fixing it to the detector mounting device 6 attached to the head in order to eliminate the influence of head movement, a character symbol board 7' is placed in front of the eyeball 1b, and the space between the character symbol board 7' and the eyeball 1b is When a person fixes the head with the head fixation device 9 to keep the distance constant and gazes at the position where the letters or symbols are written on the character symbol board 7', the movement of the human's eyes will move toward objects that are equidistant. When you look at it from a different perspective,
Since there is a property called [Version J] in which the left and right eyes move simultaneously in the same direction and by the same rotation angle, the rotation angle when the eyeball 1b gazes at the position of the written character or symbol on the character symbol board is θ' If the rotation angle of the eyeball 1a at this time is θ, then equation (1) is obtained.

θ=θ′ ・・・・・・・・・・・・・・・・・・(1) Since the position data a where the character or symbol you are looking at is written can be detected by the semiconductor two-dimensional position detector 5, Even a person with a disability can turn on the foot switch 10 to send this position data to the arithmetic processing unit 8 such as a microcomputer, convert it into a code, and supply the code signal to the device to be controlled.

A method of detecting the rotation angle of the eyeball between shims will be explained with reference to FIG.

Light is irradiated from the light source 3 to the cornea of the eyeball 1a through a half mirror 2-2 placed in front of the human eyeball 1a, and this reflected light is focused on the semiconductor two-dimensional position detector 5 via the condenser lens 4. . Here, the position of the reflected light on the semiconductor two-dimensional position detector 5 at the normal viewing position of the human eyeball 1aO is taken as the starting point J, the virtual image inside the cornea by the light source 3 at this time is taken as I, and the eyeball 1a is rotated from this position as the center of rotation. The position of the light source 3 in the semiconductor two-dimensional position detector 5 when rotated by θ around C is J
1. If the virtual image in the cornea is denoted as q', then the movement of the virtual image 2' toward the center of rotation C due to the rotation of the eyeball 1a is minute, so if it is ignored, equations (2) to (4) are obtained.

I I'=OC-Sinθ(oc=o'c=6mm)・
・-(2) θ""81 n -"("b',"o"
c') ・・・・・・・・・(4) However, a: Distance from the virtual image of the light source 3 in the cornea to the condensing lens 4, b.2 Distance from the condensing lens 4 to the semiconductor two-dimensional position detector 5 distance, O
, O': Center of curvature of the cornea during emmetropia and after θ rotation.

Therefore, from the output signal of the semiconductor two-dimensional position detector 5, JJ
By obtaining ', the rotation angle of the eyeball can be detected.

Although this explanation is one-dimensional, it can be easily expanded to two-dimensional.

Next, referring to FIG. 4, the geometric relationship between the position of the character or symbol being watched on the character symbol board and the rotation angle of the eyeball will be explained.

When the eyeball 1b rotates by θ' and gazes at a position where an arbitrary character or symbol is written on the character symbol board 7' placed in front of the eye, the rotation angle θ' of the eyeball 1b becomes as shown in equation (5).

However, h: distance from the position of normal viewing on the character symbol board 7' to the character being watched; JL: distance from the center of rotation C of the eyeball 1b during normal vision to the character symbol board 7'; therefore, formula (1),
4), (5) Yoshi (G) and f force formulas are obtained.

a-J・JJ' h= ・・・・・・・・・・・・(7) 几η Only:ll
B2J, 'Giant [Effects of the Invention] The code input device of the present invention includes, in place of the keyboard, a character symbol board and a device for measuring the movement of Iruma's eyeballs as he gazes at the character he wishes to input on the character symbol board. Yoshi,
Since there is no need to use the fingers, it can be used even by people with hand and finger disabilities.

[Brief explanation of drawings]

Fig. 1 is a block diagram including an embodiment of the present invention, Fig. 2 is a perspective view showing an example of use of the embodiment shown in Fig. 1, and Fig. 3 is a rotation angle of the human eyeball shown in Fig. 1. FIG. 4 is a conceptual diagram showing the geometric relationship between the position of the character or symbol being watched on the character symbol board shown in FIG. 1 and the rotation angle of the eyeball. . 1allb...eye g, 2...song half mirror-1
3...Light source, 4...Condensing lens, 5.
... Two-dimensional position detector, 6 ... Detector mounting device, 7 ... Character symbol board, 8 ... Arithmetic processing unit, 9 ...・・Head fixation device, 10・・・・
...Foot switch. a...Position data, b...Code signal. 1st Haku 3 Figure JJ' 4th item

Claims (1)

[Claims] a character symbol board that is gazed at by a first eyeball; a light source that illuminates a second eyeball that moves in conjunction with the first eyeball via a nof mirror; and a light source that illuminates the second eyeball that moves in conjunction with the first eyeball; A two-dimensional position detector that receives light through a lens and outputs position data, a foot switch that outputs the position data when pressed, and a code signal that encodes the position data output from the foot switch. A code input device comprising: an arithmetic processing unit that performs the following operations