JPS5937211Y2 - optical stimulator - Google Patents

Description

[Detailed explanation of the idea] This invention relates to improvements in optical stimulation devices.

It is well known that when a living body is stimulated by sound, light, electricity, etc., evoked potentials are generated in synchronization with the stimulus.

Optical stimulation devices take advantage of this, by shining a flash of light along the subject's eyes, and determining the presence or absence of a disorder in the path from the eyes to the cerebrum based on the state of the evoked potential that is generated. It is.

As shown in FIG. 1, a conventional optical stimulation device consists of a light source 1 such as a xenon discharge tube, a reflector 2 on the back side, and a protective glass plate 3 on the front side.

However, with such a structure, the light diffuses when a flash occurs, making it inconvenient that the subject cannot be irradiated locally, that is, irradiating only one eye, and the amount of light is also low.

Furthermore, because the discharge sound of the xenon discharge tube during a flash was loud, it was difficult to distinguish whether the evoked potential generated in the subject was a response to a light stimulus or a response to a sound stimulus.

During discharge, electrical artifacts (voltages mixed into biological reaction waveforms due to discharge current) are emitted, making identification even more difficult.

Note that a xenon discharge tube is used as a light source for the photostimulation device because a light source that emits light instantaneously, has no afterglow, and has a large amount of light is required.

The present invention solves the above problems all at once.

Hereinafter, one embodiment of the present invention will be explained according to the drawings.
In the figure, 11 is a housing provided with a light guide path 12 on one side.

The casing 11 is constructed of a soundproof box to prevent discharge sound from leaking outside when the xenon discharge tube flashes, and a shield wire mesh 18 is provided on the peripheral wall of the casing 11 to remove artifacts during discharge.
Install and shield.

Inside the housing 11 is a light source 13 such as a xenon discharge tube.
and a concave mirror 15 located on the back side of the light source 13 to effectively reflect the light from the light source 13 to a condenser lens 14 to be described later.
is located in front of the light source 13, and directs the light from the light source 13 and the light from the concave mirror 15 to a light guide path 1 provided on the housing wall.
a condenser lens 14 that guides the light to the light output path 12; and a correction lens 16 that is located near the light output path 12 and corrects the light condensed by the condenser lens 14 into parallel lines and guides it to the light output path 12 sufficiently effectively. is installed built-in.

Reference numeral 17 denotes a light guide body such as an optical fiber for irradiating the subject with light flowing out from the light guide path 12, and one end thereof is connected to the light guide path 12.

Note that a glass plate may be provided inside the light guide path 12 to further provide soundproofing.

As described above, the present invention uses a concave mirror and a lens to guide the flash light emitted inside the housing to the light guiding body without wasting it, so that a sufficient amount of light can be obtained and local irradiation is possible. It is possible to obtain highly accurate measurement data.

Moreover, since it has a structure that shields light sources, etc., except for the light output path, soundproofing measures can be easily taken by constructing the housing itself with a soundproof box, and it is also easy to similarly install a shielding wire mesh on the peripheral wall of the housing. This has great practical effects.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing a conventional example, and FIG. 2 is a side sectional view showing an embodiment of the present invention. 11: housing, 12: light guide path, 13: light source, 14: condensing lens, 15: concave mirror, 16: correction lens, 17: light guide body, 18: shield wire mesh.

Claims (1)

[Scope of utility model registration request] A concave mirror 15, a light source 13 made of a xenon discharge tube, and lenses 14 and 16 are disposed inside the housing 11, and the light from the light source 13 is transmitted to a light guide 17 through a light output path 12 provided on the wall of the housing. In the optical stimulation device, the casing is constituted by a soundproof box, and a shielding wire mesh 18 is stretched around the peripheral wall of the casing 11.