JP2007089853A - Led astral lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a long-life astral lamp facilitating control of light. <P>SOLUTION: A light source unit 2 for emitting parallel light comprises a plurality of reflection type LEDs 1. More than a pair of light source units are disposed in a symmetric space that contains an arbitrary point A located on a perpendicular line from a radiation object at a distance L from a radiation object. In the astral lamp, beams having different incident directions are directed to a set region centering the radiation object even when a distance B between the light source units is changed while maintaining an incident angle θ of the light source units 2 constant, when the incident angle θ is changed while maintaining the distance B between the light source units constant, or when the distance B between the light source units and the incident angle θ are changed simultaneously. With such a configuration, a radiation field having a constant size and a clear profile is obtained. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a medical surgical light illuminator mainly used in the medical field, in particular, a surgical lamp and a dental treatment.

As a medical lighting device used for conventional surgical lamps and dental treatments used in the medical field, the light source is disposed outside a reflecting mirror that is separately provided from a light bulb having a sealing portion at the end of a light emitting portion. ing. The central axis of the filament coil of the bulb is arranged so as to be perpendicular to the optical axis of the reflecting mirror, and since the facets are formed on the reflecting mirror, a shadowless effect can be produced in the irradiation field. Recently, there is also a medical surgical light irradiator using an LED as a light source (see Patent Document 1). Recently, there is also a dental treatment lighting device that irradiates an object to be irradiated with light from a plurality of light sources (see Patent Document 2).
JP 2002-306512 A Japanese Patent Laying-Open No. 2005-0665807

However, since the conventional lighting device uses an LED that is not controlled by a light bulb or light, there are the following three problems.
Problem 1: The optical axis shift due to the bending of the filament of the incandescent bulb over time, the optical displacement of the reflector due to the replacement of the bulb due to the life of the filament, and the light of the bulb is emitted from the filament in all directions Therefore, even if the design accuracy of the reflector is improved, the outline of the irradiation field is not clear, it is difficult to obtain a deep irradiation depth, and the size of the irradiation field changes greatly when the irradiation distance changes. .

Problem 2: The conventional shadow lamp irradiator has a problem that the usable range is determined because the point where the light beams intersect cannot be changed.

Problem 3: Moreover, in a medical lighting device using an LED as a light source, the light beam of the LED of the light source is generally diffused light, so that the irradiation field increases as the distance from the light source to the irradiation distance increases. End up.

Problem 4: In addition, when an LED is used as a light source, there is a possibility that the amount of light may be insufficient, but there is a problem that an operating light irradiator using an existing LED cannot be used.
The present invention has been made to solve the above-described problems in lighting devices used for medical use, particularly dental treatment.

In order to solve the above problem, the invention described in claim 1 is directed to the object to be irradiated in a symmetrical space including an arbitrary point A at a distance L from the object to be irradiated, which is on a perpendicular line to the object to be irradiated. An LED light source unit that emits a pair of parallel light beams is placed, and the perpendicular to the irradiated object and the incident angle θ of the light beam emitted from the light source unit always maintain a constant angle and respond to changes in the irradiation distance L Thus, by changing the distance B between the light source units by B = 2L · tan θ, light beams having different incident directions are always directed to a certain region centered on the irradiated object, and the size of the irradiation field becomes constant. This is a surgical light illuminator characterized by the following.

The invention according to claim 2 is a pair of parallel light beams always directed to the irradiated object in a symmetrical space including an arbitrary point A at a distance L from the irradiated object, which is on a perpendicular line to the irradiated object. The LED light source unit that emits light is placed, and the normal to the object to be irradiated and the incident angle θ of the light beam emitted from the light source unit are changed according to the change in the irradiation distance L, so that the constant area centered on the object to be irradiated The surgical light illuminator is characterized in that light beams having different incident directions are always directed to the same, and the size of the irradiation field is constant.

The invention according to claim 3 is a pair of parallel lights that are always directed to the irradiated object in a symmetric space including an arbitrary point A at a distance L from the irradiated object, which is on a perpendicular line to the irradiated object. The LED light source unit that emits light is placed, and the distance B between the light source units, the perpendicular to the irradiated object, and the incident angle θ of the light beam emitted from the light source unit are changed according to the change in the irradiation distance L The surgical light illuminator is characterized in that light beams having different incident directions are always directed to a predetermined region centered on the irradiation object, and the size of the irradiation field is constant.

In the invention according to claim 4, a pair of parallel lights always directed to the irradiated object is provided in a symmetric space including an arbitrary point A at a distance L from the irradiated object, which is on a perpendicular line to the irradiated object. By placing an emitting LED light source unit and directing light beams emitted from the LED light source unit to the irradiated object, and irradiating the irradiated object with parallel light controlled from the upper surface of the irradiated object 4. The surgical light irradiation according to claim 1, wherein the irradiation field is constant and the amount of light can be increased even if the distance L from the object to be irradiated changes.

As for the problem 1, the use of a reflective LED as a light source eliminates the need for optical axis adjustment that was necessary when using a light bulb. Further, since the LED is a point light source, the design accuracy can be improved, and the shape and contour of the irradiation field can be made clear.

As for problem 2, by using claims 1 to 3, it is possible to change the point where the light beam intersects, and it is possible to provide a shadowless effect by intersecting the light beam at a position desired by the user. .

Further, regarding the problem 3, by using a reflective LED that emits parallel light to the light source, the irradiation field does not change even if the irradiation distance L changes.

As for Problem 4, by using Claim 4, a sufficient amount of light as a shadowless lamp can be secured.
As described above, according to the present invention, by using the light source unit 2 using a reflective LED that emits parallel light to the light source, it has a long life and does not require adjustment of the optical axis, and the object to be irradiated. Since the light is directed three-dimensionally, a shadowless effect is obtained, and even if the irradiation distance L varies, the irradiation field has a constant size and a sharp outline, and is particularly suitable for dental treatment. An irradiator is obtained.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of an LED light source unit 2 used in the present invention, in which reflective LEDs 1 that emit parallel light are closely mounted as a light source.

FIG. 2 is a ray tracing diagram when two light source units 2 are arranged. A shadowless effect can be obtained by irradiating the object to be irradiated with parallel light from light sources in different directions. Further, hereinafter, the distance to an arbitrary point A on the perpendicular to the irradiated object is L, the distance between the light source units 2 is B, and ∠AXY is the incident angle θ.

FIG. 3 is a ray tracing diagram when the distance B between the light source units 2 is changed to B ′ according to the change of the irradiation distance L when the irradiation distance L is changed to L ′. It is shown that by changing the distance B between the light source units 2, it is possible to cope with the change in the irradiation distance L in a state where the irradiation field is a constant size and the outline is clear. The shorter the distance B between the light source units 2 is, the shorter the irradiation distance L is. On the contrary, the longer the distance B between the light source units 2 is, the longer the irradiation distance L is.
This relationship is expressed by B = 2L · tan θ.
From this equation, the distance B between the light source units 2 when the irradiation distance L changes is obtained.

In FIG. 4, by changing the incident angle θ from the light source unit 2 when the irradiation distance L changes to L ′, the irradiation field can be dealt with the change in the irradiation distance L with a constant size and a clear outline. It shows that it has become. The irradiation distance L decreases as the incident angle θ from the light source unit 2 increases. When this relationship is expressed by an equation, θ = tan ⁻¹ (B / 2L).

With this equation, when the irradiation distance L changes, the incident angle θ for aligning the intersection point of the rays with the point of the irradiation distance L can be obtained.

FIG. 5 shows that when the irradiation distance L changes to L ′, the irradiation field is fixed in size and has a clear outline by changing the distance B between the light source units 2 and the incident angle θ from the light source unit 2. It shows that the distance L can be changed. This relationship can be expressed by using B = 2L · tan θ and θ = tan ⁻¹ (B / 2L).

In addition to FIG. 2, FIG. 6 shows a light source unit 2 that emits parallel light to irradiate the irradiated object from the upper surface, and is attached to the center of the irradiator. By adding a light source that emits parallel light to the central part of the irradiator used in claims 1 to 3, a light beam such as 4 in FIG. 6 can be obtained, and the irradiation field size remains constant. The amount of light on the object can be increased.

Next, the reflective LED chip used in the present invention will be described.
7 is a longitudinal sectional view of the reflective LED chip 5, FIG. 8 is a bottom view of the reflective LED chip 10, and FIG. 9 is a right side view of the reflective LED chip 5. As shown in these drawings, the reflective LED chip 5 is formed in a substantially rectangular shape, a chip case 8 that houses the LED element 6 and the reflecting mirror 7, and a chip from a substantially central portion of the bottom surface 8A of the chip case 8. Two leads 9A and 9B extending toward the left and right sides of the case 8 and extending upward along the left and right side surfaces 8B and 8C of the chip case 8 are provided.

The LED element 6 is disposed in the shape of a substantially central portion of the bottom surface 8A of the chip case 8 with the light emitting surface 6A facing upward, and is electrically connected to each of the leads 9A and 9B by a metal wire 10. In addition, the upper ends 11 of the leads 9A and 9B function as sockets.

The leads 9A and 9B are formed of a metal plate having high thermal conductivity, and the lower end 12 of one lead 9B of the two leads 9A and 9B is arranged facing the lower surface of the LED element 6, The heat generated by the LED element 6 is effectively radiated through the lead 9B.

The reflecting mirror 7 has a reflecting mirror 7 formed in a rectangular shape, and the reflecting surface 7A is disposed so as to cover the upper surface (light emitting surface) of the reflective LED chip 5. Further, a metal film such as aluminum or an optical thin film such as a cold mirror having a high light reflectivity is formed on the reflecting surface 7A.

That is, the light emitted upward from the light emitting surface 6A of the LED element 6 is reflected toward the bottom surface 8A side of the chip case 8 by the reflecting surface 7A of the reflecting mirror 7, and the broken arrows C and C ′ in FIG. As shown by, light is irradiated with the bottom surface 8A of the chip case 8 as the radiation surface. A space 7B between the reflective LED chip 5 and the reflecting mirror 7 is filled with a resin agent such as an epoxy resin in order to protect the reflective LED chip 5.

Next, examples of the present invention will be described. This shadowless lamp comprises a unit that emits parallel light using a plurality of reflective LEDs as a light source. Consider, for example, the case where two such units are used. In general, the irradiation distance L of a surgical light used for dental treatment is about 650 mm, and the distance B between the light source units 2 when the irradiation distance L changes is obtained from B = 2L · tan θ. In this embodiment, the incident angle is set to θ = 4.5 ° in order to obtain an appropriate irradiation field as a surgical light. If the incident angle θ = 4.5 °, the result is as shown in FIGS. FIG. 10 shows that the distance B between the light source units 2 becomes 63 mm when the irradiation distance L = 400 mm and the incident angle θ = 4.5 °. FIG. 11 shows that the distance B between the light source units 2 is 102 mm when the irradiation distance L is 650 mm and the incident angle θ is 4.5 °. FIG. 12 shows that the distance B between the light source units 2 is 157 mm when the irradiation distance L = 1000 mm and the incident angle θ = 4.5 °.

Table 1 summarizes the results. As a result, when the incident angle θ = 4.5 °, the distance B between the light source units 2 is moved from 63 mm to 157 mm, so that the irradiation distance of 400 mm to 1000 mm generally used in a dental surgical light is obtained. Thus, it is possible to obtain a shadowless effect with a clear outline and a uniform size of the irradiation field.

Next, another embodiment of the present invention is shown in FIGS. The light source unit 2 has the same configuration as in the first embodiment. As described above, the irradiation distance L of the surgical lamp generally used for dental treatment is about 650 mm. When the irradiation distance L changes, the distance between the light source units 2 is fixed. When the incident angle θ is changed, the relationship between the incident angle θ and the irradiation distance L is examined using θ = tan ⁻¹ (B / 2L).
When the distance between the light source units 2 is 100 mm, the irradiation distance L and the incident angle θ are as shown in Table 2.

これにより光源ユニット間距離が１００ｍｍの場合、入射角度θは図１３〜１５に示すように２．９°〜７．１°動かすことにより、歯科用の無影灯で一般的に利用される照射距離４００ｍｍ〜１０００ｍｍの範囲で照射野の大きさ一定で輪郭が鮮明な無影効果を得られる。

As a result, when the distance between the light source units is 100 mm, the incident angle θ is moved from 2.9 ° to 7.1 ° as shown in FIGS. A shadowless effect with a clear outline and a clear outline can be obtained within a distance of 400 mm to 1000 mm.

Next, another embodiment of the present invention will be described. The light source unit 2 has the same configuration as that of the first and second embodiments. A change in the irradiation distance L when the distance B between the light source units 2 and the incident angle θ are simultaneously changed is obtained using L = B / (2 tan θ).
Table 3 shows the results when the incident angle θ is changed to 10 °, 20 °, and 30 ° when the distance B between the light sources is changed to 100, 200, and 300 mm using this equation. is there.

In this way, by selecting the distance B between the light source units and the incident angle θ, it is possible to obtain from the calculation at which irradiation distance the light beam is crossed.

It is a front view of the surgical light which concerns on embodiment of this invention. It is a ray trace figure of a light source unit. It is a ray tracing diagram when the irradiation distance L and the distance B between light source units change. It is a ray tracing diagram when the irradiation distance L and the incident angle θ of the light source unit change. It is a ray tracing diagram when the distance B between light source units and incident angle (theta) change. FIG. 3 is a ray tracing diagram when a light source unit is added to the center of the light source unit of FIG. 2. It is a longitudinal cross-sectional view of a reflective LED chip It is a bottom view of a reflective LED chip It is a right view of a reflective LED chip. It is a figure showing the change of the distance B between light source units when the irradiation distance L changes with incident angle (theta) constant. It is the same figure as FIG. It is a figure similar to FIG. 10, FIG. It is a figure showing the change of incident angle (theta) when the irradiation distance L is changed with the distance B between light source units constant. It is a figure similar to FIG. It is a figure similar to FIG. 13, FIG.

Explanation of symbols

1 reflective LED
2 Light source unit 3 Volume 4 Light beam 5 Reflective LED chip 6 LED element 6A LED element light exit surface 7 Reflective prism (reflector)
7A Reflecting surface 8 Chip case 9A, 9B Lead 10 Metal wire 11 Socket L Distance from the irradiated object to an arbitrary point A (the irradiation distance)
θ The perpendicular to the object to be irradiated and the incident angle of the light beam emitted from the light source A A point at an arbitrary distance from the object to be irradiated B The distance between the light source units C, C ′ The light beam from the LED element X The object to be irradiated Position Y Light source unit position

Claims (4)

An LED light source unit that always emits a pair of parallel light beams directed to the irradiated object is placed in a symmetrical space including an arbitrary point A at a distance L from the irradiated object, which is on the perpendicular to the irradiated object. In addition, the perpendicular to the object to be irradiated and the incident angle θ of the light beam emitted from the light source unit always maintain a constant angle, and the distance B between the light source units is B = 2L · tan θ according to the change of the irradiation distance L. A shadow lamp irradiator characterized in that, by changing, a light beam having a different incident direction is always directed to a predetermined region centered on the object to be irradiated, and the size of the irradiation field becomes constant. An LED light source unit that always emits a pair of parallel light beams directed to the irradiated object is placed in a symmetrical space including an arbitrary point A at a distance L from the irradiated object, which is on the perpendicular to the irradiated object. Depending on the change of the irradiation distance L, the perpendicular to the object to be irradiated and the incident angle θ of the light beam emitted from the light source unit are changed. A surgical light illuminator characterized by being directed and having a constant field size. An LED light source unit that always emits a pair of parallel light beams directed to the irradiated object is placed in a symmetrical space including an arbitrary point A at a distance L from the irradiated object, which is on the perpendicular to the irradiated object. Even if the distance B between the light source units, the perpendicular to the object to be irradiated, and the incident angle θ of the light beam emitted from the light source unit are changed in accordance with the change in the irradiation distance L, the center of the object to be irradiated remains constant. A surgical light illuminator characterized in that light beams having different incident directions are always directed to the area, and the size of the irradiation field is constant. An LED light source unit that emits a pair of parallel lights always directed to the irradiated object is placed in a symmetrical space including an arbitrary point A at a distance L from the irradiated object on a perpendicular to the irradiated object, In addition to directing the light emitted from the LED light source unit toward the irradiated object, the distance L from the irradiated object is obtained by irradiating the irradiated object with parallel light controlled from the upper surface of the irradiated object. 4. The surgical light irradiator according to claim 1, wherein the irradiation field is constant and the amount of light can be increased even if the light intensity changes.

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