JP2001212067A - Head mirror - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head mirror capable of preventing the flare of an image of a light source irradiated on an affected area from occurring in a mirror mounted on a doctor's forehead to observe the affected area by irradiating, on the affected area, only the lights emitted toward a focus among the lights radiated from a light source and shutting out the lights in other directions. SOLUTION: This head mirror is provided with a mirror 3 having a peephole 4 and a light source A placed facing the mirror 3. The surface of the mirror 3 is formed into a concave which is a curved surface near the end of major axis in a spheroid obtained by rotating an ellipsoid which has two focuses of the light source A and a focus F located on a visual line 11 passing through the peephole 4 around an A-F axis connecting the two focuses to constringe the light of the source A reflected by the mirror 3 to the focus F. The light source a comprises an aggregate in which a plurality of LEDs are arranged, and a cap 12 which has a hole 13 passing only light from the light source A directing to the focus F at the central part thereof is detachably attached to the front of the light source A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mirror which is used by a doctor when wearing a forehead when looking into the back of the throat or the ear canal. It is related to a frame mirror to be performed.

[0002]

2. Description of the Related Art Conventionally, a light is applied from a light source to a mirror with a forehead mirror.
The light source illuminates the affected part with the reflected light, and the light is guided to the forehead mirror by an optical fiber from a light source device placed separately from the forehead mirror, or the light source is directed toward the mirror to the fixed band or bracket of the forehead mirror. Some are attached.

[0003] However, when the light from the light source is guided by an optical fiber for irradiation, the affected part can be irradiated with a light beam that does not diffuse so much. However, a shadow due to the shift occurs. In the case where the light source is attached to the fixed band or bracket of the forehead mirror toward the mirror, the light source and the mirror move simultaneously when the doctor changes the direction of the forehead, and the light of the light source reflected by the mirror is always According to the direction of the doctor's face, in this case, the optical axis of the light beam reflected by the mirror does not coincide with the line of sight because of the structure in which the concave portion for passing the line of sight is provided at the lower side of the mirror.

[0004] Further, in the conventional apparatus for irradiating an affected part by reflecting light from a light source of a forehead mirror with a concave mirror, the light is emitted in only one direction, so that the optical axis shifts every time the examiner moves his / her face. In addition, since irradiation is performed over a wide area around the affected part, the surrounding area is illuminated more brightly than the back of the throat and the ear canal, making it difficult to see the affected part.

[0005]

Therefore, when observing the depth of the ear canal, the present applicant can obtain a stable illuminance that does not change much due to the movement of the face or the like with a relatively small light source.
Japanese Patent Application No. 9-215 proposes a frame mirror that can easily and accurately observe an affected area with less shadow.
535 (Japanese Patent Application Laid-Open No. 11-42213).

As shown in FIG. 4, a frame mirror according to the present invention comprises a mirror 3 'having a viewing hole 4' and a light source A 'installed toward the mirror 3'. The viewing hole 4 'is located substantially at the center of the mirror 3', and the light reflected by the mirror 3 'of the hole A' is made to converge to a predetermined focal point F 'on the line of sight 11' passing through the viewing hole 4 '. It is characterized by. As means for converging the reflected light to the focal point F ', an ellipse having the mirror surface of the mirror 3' as a light source A 'and a focal point F' as two focal points is formed around an A'-F 'axis connecting the two focal points. This is a concave mirror having a curved surface near the major end of a spheroid obtained by rotation.

In the present invention, the light radiated from the light source A 'is reflected by a mirror existing all around the peephole, and is determined by the design on the line of sight 11' passing through the peephole 4 'at the center of the mirror 3'. Reflected at the focal point F ′. A spheroid mirror is most suitable as the mirror 3 'having such an action. In addition, near the focal point F ′, there are light rays reflected from all the mirror surfaces of the line of sight 11 ′ above, below, left and right.
Is irradiated with light coming from above, so that shadows can be greatly reduced in the irradiated portion.

However, theoretically, when the light incident from the point light source is reflected by a mirror, the reflected light can be controlled in one direction. However, the light radiated from the light source A 'having a size actually becomes the light shown in FIG. It is radiated in all directions as a bundle, not a single line as represented by. Also, as for the focal point, if the light source device is arranged on the center line connecting the two focal points of the ellipse, a light source image like a petal is expected to be obtained. However, in actuality, light is blocked by the light source device. This obstructs the peephole and eliminates its role as an instrument. Therefore, to avoid this, the mirror surface is shifted downward,
In this case, a flare occurs in the light source image. Therefore, the irradiated diseased part also becomes brightly illuminated in the surroundings, and is difficult to see.

[0009] In addition, the LEDs disposed in the peripheral portion are disposed toward the center, but the LED in the peripheral portion has a larger error in the emitted light than the LED in the central portion. And flare are likely to occur. Also, when the LED itself emits light, it does not radiate a uniform light to the entire circumference, but the light goes to the tip of the center so that it becomes the brightest, but the surrounding light is not always concentrated at one point Radiation and flare are inevitable.

In view of the above, the present invention irradiates the affected part with only light directed toward the focal point out of the light emitted from the light source, and blocks the light emitted from the light source in other directions.
An object of the present invention is to provide a frame mirror capable of preventing occurrence of flare of a light source image irradiated on an affected part.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a framed mirror according to the present invention comprises a mirror provided with a peephole, and a light source A installed toward the mirror. The mirror is located at the center, and the mirror surface is formed by an ellipse having two focal points, a light source A and a focal point F on a line of sight in which light reflected by the mirror of the light source A passes through the viewing hole. The light source A is formed in a concave shape having a curved surface near a major end of a spheroid obtained by rotating around an axis, and the light source A is a frontal surface of the light source A in a frame mirror composed of an aggregate in which a plurality of LEDs are arranged. It is characterized in that a cap having at the center thereof a hole through which only light from the light source A heading toward the focal point F passes is detachably provided.

In the present invention having the above structure, the light source A is provided with a detachable cap having a hole at the center for passing only the light from the light source A toward the focal point F. Peripheral light traveling in directions other than the above does not pass through the hole of the cap, and is thus blocked. In particular, among the plurality of LEDs, the peripheral LEDs are not canceled out by the mutual light as compared with the central LED, and are not affected by the affected part. Irradiation is performed as a non-uniform light source image. When the light source image is blocked, the occurrence of flare is prevented, and a uniform light source image can be obtained with a light flux that does not diffuse to the affected part, making the affected part easier to see.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a frame mirror of the present invention, in which 1 is a fixed band for attaching the frame mirror to the head.
2 is a bracket extending from the fixing band 1, 3 is a mirror, 4 is a mirror 3
5 is a mirror frame holding the mirror 3, 6 is a bracket extending from the mirror frame 5, and the front ends of the fixed band side bracket 2 and the lens frame side bracket 6 are freely movable. They are connected by a joint 7.

A is a light source such as an LED, and includes a plurality of LEDs.
, And a plurality of LEDs are arranged concentrically around an LED arranged in the center and directed to a predetermined focal point on the optical axis of the LED in the center. Reference numeral 8 denotes an arm for holding the light source A. The arm 8 extends integrally from the bracket 6 on the lens frame side, and the light source A is attached to the tip of the arm 6 so as to face the mirror 3. Reference numeral 9 denotes a case containing a battery for emitting light from the light source A, and power is supplied to the light source A from the battery case 9. The switch 10 for blinking the light source A is provided in an appropriate place that is easy to operate.

The mirror surface of the mirror 3 receives light radiated from the light source A at a position deviated from the line of sight 11 (which may be up, down, left or right). (About 30 cm). The mirror surface of the embodiment shown in FIG.
-A concave mirror utilizing a circular region whose center near the major axis end obtained by rotating around the F axis is deviated from the major axis.

Reference numeral 12 denotes a cap which is detachably provided on the front of the light source A.
Are drilled. The cap 12 is the socket 1 of the light source A.
4 may be screwed to the outside, or the socket 1
4 may be merely fitted. As shown in FIG. 2, the holes 13 are light emitted from a plurality of LEDs of the light source A, and the light distribution from the periphery of the central LED is canceled by the strong light directed to the surrounding focal point F, but the distribution of the LEDs in the peripheral portion is reduced. Light (indicated by a dashed line) directed to the mirror surface is deviated from the focal point F and causes flare. This light distribution is blocked by the cap 12, and only the light traveling to the focal point F passes mainly through the hole 13.

FIG. 3 shows the relationship in which the diffusion range for irradiating the affected part varies depending on the size of the hole 13.
The light passing through the small-diameter hole is a small area CC at the affected area P.
Since the light source image between the large area L and the light passing through the hole having the large diameter L can be obtained at the affected area P, the size of the hole 13 differs depending on the affected area.
Select and use.

[0018]

According to the present invention, the light from the light source A toward the mirror and the surrounding light from the direction other than the focal point F is blocked by the cap, and only the light toward the focal point F passes through the hole of the cap. The light source image applied to the affected part is prevented from generating flare, becomes a uniform light source image, and is very easy to see.
Further, the irradiation range of the light source image can be selected, and illumination corresponding to the affected part can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a frame mirror according to the present invention.

FIG. 2 is a sectional view of a main part showing an embodiment of a frame mirror according to the present invention.

FIG. 3 is a sectional view of an essential part showing an embodiment of a frame mirror according to the present invention.

FIG. 4 is a cross-sectional view illustrating the use of a conventional frame mirror.

[Explanation of symbols]

 3 mirror 4 viewing hole A light source 11 line of sight 12 cap 13 hole F focal point P affected area

Claims (1)

[Claims] 1. A mirror provided with a peephole and a light source A directed toward the mirror, wherein the peephole is substantially at the center of the mirror,
The mirror rotates an ellipse whose two surfaces are a light source A and a determined focus F on a line of sight in which light reflected by the mirror of the light source A passes through the viewing hole, around an A-F axis connecting the two focuses. The light source A is formed as a curved concave surface near the major axis end of the spheroid obtained as described above, and the light source A is directed toward the focal point F on the front surface of the light source A in a frame mirror composed of an aggregate in which a plurality of LEDs are arranged. A frame mirror comprising a detachable cap having a hole at a central portion through which only light from a light source A passes.