JP2007044334A - Electronic device, its sterilizing method and shadowless lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and highly efficiently sterilize the inside of an electronic device. <P>SOLUTION: An ultraviolet ray LED 5B is provided inside a case 2 of an electronic device such as a shadowless lamp, and irradiates ultraviolet rays inside the case 2 to sterilize the inside of the case 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hygiene maintenance technique, and more particularly to a sterilization technique for maintaining a good hygiene state in an electronic device.

  In recent years, along with the development of electronic technology, a large number of electronic devices are also used in medical care to support advanced medical technology. For example, electronic devices such as monitor devices that monitor the patient's biological condition, automatic infusion devices that manage infusions, and surgical lights used to illuminate the oral cavity (dental lights) and affected areas are used in modern medical settings. It is an indispensable existence.

  Since this type of electronic device is used in the immediate vicinity of the patient, it is necessary to maintain the hygiene of the electronic device itself. For example, because exposed parts that are touched by an unspecified number of people, such as handles and operation switches provided on electronic devices, are likely to be adhered to microorganisms such as bacteria and viruses, such areas are regularly sterilized. Need to be processed.

  Conventionally, in order to maintain the hygiene of such electronic devices, the electronic devices have been sterilized and washed using a disinfectant such as alcohol or ozone water. For example, the microorganism can be sterilized by immersing the disinfectant in a cloth and wiping the exposed portion of the electronic device. In some cases, microorganisms can be sterilized by disassembling electronic devices and immersing washable parts other than electronic circuits in the disinfectant (see, for example, Non-Patent Document 1).

http://www.delta21.jp/panaozone/index.html, Pana-Ozone Corporation

However, such a conventional technique has a problem in that the inside of the electronic device cannot be easily sterilized because a liquid disinfectant is mainly used.
Since an electronic device generates a certain amount of heat, an environment in which various germs are likely to propagate may be formed at a specific location in the electric device such as the back side of the printed circuit board. Also, there is a tendency to use air cooling fans to dissipate the heat generated inside the electronic equipment to the outside of the equipment. There is a case where an environment is formed in which dusts are collected and bacteria are easy to propagate. Since a precise electronic component is mounted at a specific location in such an electronic device, the electronic component may be denatured by the liquid disinfectant and cannot be easily sterilized by the disinfectant.

  On the other hand, in addition to disinfectants, medical devices are sterilized using ultraviolet light emitted from a light source such as a mercury lamp. For example, by storing a medical device for a long time in a closed room irradiated with ultraviolet light such as an ultraviolet light sterilization storage, microorganisms adhering to the medical device can be sterilized. A method of sterilizing each part of the electronic device decomposed by storing in an ultraviolet light sterilization storage is also conceivable. However, since it is necessary to disassemble the electronic equipment and store it in the ultraviolet light sterilization storage for a long time, enormous work and time are required. The inside of the device cannot be easily sterilized.

  The present invention has been made to solve such problems, and an object thereof is to provide an electronic device capable of easily and efficiently sterilizing the inside of the electronic device, a sterilization method thereof, and a surgical light.

  In order to achieve such an object, an electronic apparatus according to the present invention includes a case that houses an electronic circuit, and an ultraviolet LED that is provided inside the case and that irradiates ultraviolet light inside the case. is there.

At this time, near-ultraviolet light among ultraviolet light may be irradiated by the ultraviolet LED.
Moreover, you may provide the switch which detects opening / closing of a case and controls the power supply to ultraviolet light LED.
Further, a power supply unit that constantly supplies drive power to the ultraviolet LED in response to supply of operating power to the electronic circuit may be provided.

Moreover, you may irradiate an ultraviolet light to the inner chamber formed by the printed circuit board surface in which the electronic circuit was mounted, and the case inner side surface among ultraviolet light LED by the ultraviolet light LED.
Moreover, you may irradiate a ultraviolet light to the location where dust is collected with the air cooling fan provided in the said electronic device among the case inside with ultraviolet light LED.
Moreover, it is arrange | positioned at the corner inside a case with ultraviolet light LED, and you may irradiate an ultraviolet light toward case inner space.

Moreover, you may provide the reflection part which reflects the ultraviolet light irradiated from ultraviolet light LED into a case room.
Further, the electronic device may be a medical surgical lamp including a light source and a lens that collects light irradiated from the light source and illuminates an arbitrary affected part.

  Moreover, the sterilization method of the electronic device concerning this invention irradiates ultraviolet light inside a case with the ultraviolet light LED provided inside the case of the electronic device.

  In addition, the surgical light according to the present invention is mounted on the inside of the case and a plurality of white light LEDs used as a light source are mounted on the printed circuit board, and the white light LED is mounted on the inside of the case. A lens having a convex portion for condensing the white light emitted from the white light LED and irradiating the outside of the case at a facing position, a substrate surface on the opposite side of the white light LED mounting surface of the printed circuit board, and the case An ultraviolet LED that irradiates ultraviolet light to an inner chamber formed by the inner surface is provided.

  According to the present invention, the ultraviolet light LED is provided inside the case of an electronic device such as a surgical light, and the inside of the case is sterilized by irradiating the inside of the case with ultraviolet light. Compared to the case of using or the case where the electronic device is decomposed and irradiated with ultraviolet light, the inside of the electronic device can be sterilized easily and efficiently.

Next, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
First, with reference to FIGS. 1-3, the shadowless lamp concerning the 1st Embodiment of this invention is demonstrated. FIG. 1 is an external view of a surgical light according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the shadowless lamp body according to the first embodiment of the present invention. FIG. 3 is a longitudinal sectional view of the surgical lamp body according to the first embodiment of the present invention. 2 is indicated by a line II-II in FIG. 3, and the broken position in FIG. 3 is indicated by a line III-III in FIG.

  Hereinafter, as an electronic device according to the present invention, an explanation will be given by taking, as an example, a surgical light used for illumination of a specific part necessary for various medical treatments such as a surgical light (dental light) used for illumination in the oral cavity in dentistry. To do.

  In general, the surgical light is used for the purpose of irradiating a specific site such as the oral cavity or affected part during treatment or examination, so that a light-shielding object such as a doctor's hand enters the light path of the shadowless light. Even if it is shielded from light, it is necessary to ensure high shadowlessness and illumination uniformity. The “shadowlessness” refers to the degree to which no shadow image is generated in the illumination area even if the light shielding object enters the light path having a predetermined illumination area. “Illumination uniformity” The degree to which the beam of shadowless light is uniformly and diffused within the illumination area.

In order to irradiate such shadowless light, the shadowless lamp according to the present embodiment uses a plurality of white light LEDs as a light source, condenses white light from these white light LEDs by a lens, It is configured to irradiate a predetermined illumination area as light.
As shown in FIG. 1, the shadowless lamp includes a lamp body 1 that irradiates the shadowless light 10, a handle 1A fixed to the right side and the left side of the lamp body 1, and an operation of the handle 1A. The arm 1B is configured to freely support the lamp body 1 so as to be in an arbitrary position and orientation. The arm 1B is provided with a switch 1C for on / off control of irradiation of the shadowless light 10 from the shadowless lamp.

  As shown in FIGS. 2 and 3, the case 2 of the lamp body 1 is made of metal or plastic resin and has a rectangular parallelepiped shape having an opening 3 in the left direction. The back plate 2B, the right plate 2R, It consists of a plate 2U and a lower plate 2D. The left side plate 2 </ b> L of the lamp body 1 is made of metal or plastic resin and is fitted into the opening 3 of the case 2.

  Inside the case 2 are a printed circuit board 4 with the left end attached to the left side plate 2L, a filter 7 attached to the right side plate 2R, the upper plate 2U, and the lower plate 2D at the right end, upper end, and lower end, and a lens. 8 and a cover 9 are arranged. At the time of assembly, the printed circuit board 4 is inserted into the case 2 from the opening 3 of the case 2, the left side plate 2 </ b> L is fitted into the opening 3, and is screwed into the mounting portion 3 </ b> A provided on the opening end side of the back plate 2 </ b> B. Fixed at 3B. A wiring cord 4C is wired from the printed circuit board 4 through the left side plate 2L to the arm 1B.

  On the printed circuit board 4, a plurality of white light LEDs 5 </ b> A are mounted, for example, in a vertical and horizontal matrix, and a filter 7, a lens 8, and a cover 9 are arranged in this order on the front surface. The filter 7 is made of a translucent member such as glass or acrylic resin, and is disposed between the white light LED 5A and the lens 8 and has a function of adjusting the color of the white light emitted from the white light LED 5A. The lens 8 is made of a translucent member such as glass or acrylic resin, has a convex portion 8A at a position facing each white light LED 5A, and has a function of condensing white light from each white light LED 5A. . The cover 9 is made of a translucent member such as glass or acrylic resin, and has a function of preventing dirt from adhering to the lens 8.

  Therefore, according to the operation of the switch 1C, power is supplied to each white light LED 5A to light it, and the white light from each white light LED 5A is condensed by the convex portion 8A of the lens 8 through the filter 7, and covered. 9 is irradiated outside the case with a predetermined irradiation range. Thereby, the white light from the white light LEDs 5A having different arrangement positions is irradiated to the predetermined illumination area by the respective convex portions 8A, and the desired shadowless light 10 is formed.

In the present embodiment, an ultraviolet LED is provided inside the case of an electronic device such as a surgical lamp, and the inside of the case is sterilized by continuously irradiating ultraviolet light inside the case. Is.
Specifically, as shown in FIGS. 2 and 3, the ultraviolet light LED 5B is provided on the substrate surface 4B opposite to the mounting surface 4A of the printed circuit board 4 on which the white light LED 5A is mounted. The inner chamber 2I formed by the inner surfaces of the face plate 2B, the right plate 2R, the upper plate 2U, the lower plate 2D, and the left plate 2L is continuously irradiated with ultraviolet light.

FIG. 4 is an explanatory diagram showing the arrangement of ultraviolet LEDs.
When the interior of the inner chamber 2I is sterilized with the ultraviolet light LED 5B, the ultraviolet light is irradiated from the corner of the inner chamber 2I toward the central region 2J of the inner chamber 2I, so that the ultraviolet light is irradiated to every corner of the inner chamber 2I. And can be sterilized efficiently.
Specifically, as shown in FIG. 4, the ultraviolet LED 5B is arranged on the peripheral portion of the substrate surface 4B of the printed circuit board 4, and the irradiation direction is mounted toward the central region 2J of the inner chamber 2I.

It has been confirmed by experiments by M. Luckiesh et al. That ultraviolet rays contained in the sun rays have a strong bactericidal action against microorganisms. The result is 99.99% sterilized after a minute.
The strength of the sterilization line required to sterilize any fungus is expressed by the sterilization line irradiance equivalent to the illuminance in the photometric quantity, and generally, the sterilization dose (mW) multiplied by the irradiation time. • sec / cm ² ) is used. For example, the sterilization dose for E. coli is 5.4 and the sterilization dose for influenza is 6.6.

DNA (deoxyribonucleic acid), which controls the genetic information of organisms, has a band that absorbs light near the wavelength of 260 nm, and it has been confirmed that it will die when irradiated with microorganisms such as bacteria and viruses. This is thought to be because the DNA copy function is affected and cannot proliferate (for example, see http://www.iwasaki.co.jp/chishiki/uv/).
FIG. 5 is a graph showing the relationship between the wavelength of light and the sterilizing ability. The horizontal axis represents the wavelength [nm] of light, and the vertical axis represents the relative sterilizing ability value with respect to the sterilizing ability at a wavelength of 300 nm.

On the other hand, in recent years, LEDs that irradiate ultraviolet light have been developed. In particular, near-ultraviolet LEDs having a wavelength of 300 to 400 nm that can be included in sunlight are used as sensors for detecting fluorescent substances, fluorescent marks, and the like for industrial use, for example. It has been put into practical use, can be obtained at a relatively low cost, and has the same bactericidal action as sunlight.
In the present embodiment, the inner chamber 2I of the lamp body 1 is sterilized using the ultraviolet LED 5B that emits ultraviolet light having such sterilization ability.

Such ultraviolet light affects not only microorganisms but also the human body. Therefore, when the inner chamber 2I to which the ultraviolet light is irradiated is sealed, the ultraviolet light is not irradiated to the outside and it is safe. However, when the lamp body 1 is opened for maintenance or the like, the ultraviolet light is exposed to the outside. Irradiated.
In the present embodiment, a switch 6 for detecting a fitting state between the left side plate 2L and the case 2 is provided in the opening 3, and only when the switch 6 detects that the left side plate 2L has been fitted into the case 2. The ultraviolet LED 5B emits light.

FIG. 6 is a configuration example of a switch for detecting the mating state. Here, the switch 6 is disposed on the board surface 4B of the printed circuit board 4 at a position where the lever 6A contacts the tip of the mounting screw 3B of the left side plate 2L.
As shown in FIG. 6A, when the screw 3B is completely tightened and the screw 3B reaches the back, the fitting between the case 2 and the left side plate 2L is completed. In such a case, since the lever 6A is operated by the screw 3B and the switch 6 is turned on, the driving power is supplied to the ultraviolet LED 5B and the ultraviolet light is irradiated.

On the other hand, as shown in FIG. 6B, when the screw 3B is not completely tightened and the screw 3B does not reach the back, the fitting between the case 2 and the left side plate 2L is not completed. In such a case, the lever 6A is not actuated by the screw 3B and the switch 6 is turned off, so that the power supply to the ultraviolet LED 5B is cut off and the ultraviolet light is not irradiated.
Therefore, since the irradiation of ultraviolet light is automatically stopped when the screw 3B is loosened due to maintenance or the like and the removal operation of the left side plate 2L is started, the influence of the ultraviolet light on the human body can be suppressed.

FIG. 7 is a circuit diagram of the surgical lamp according to the first embodiment of the present invention.
The power supply circuit 5 receives an operation power supply such as an AC 100V commercial power supply as an input, stabilizes the direct current, and outputs a drive power supply Vw for the white light LED 5A and a drive power supply Vuv for the ultraviolet LED 5B. A switch 1C for controlling the irradiation of white light is connected in series between the drive power supply Vw and the white light LED 5A. The power supply circuit 5 may be provided on the arm 1 </ b> B or an arm base that supports the arm 1 </ b> B, or may be mounted on the printed circuit board 4.

  For the white light LED 5A, a series connection circuit of a plurality of LEDs and a current adjusting resistor R1 is connected in parallel. In the ultraviolet LED 5B, a plurality of LEDs and a current adjusting resistor R2 are connected in series. The connection form of these white light LED 5A and ultraviolet light LED 5B is not limited to this, and a known connection form may be used.

Further, the switch 6 described above is connected in series between the drive power supply Vuv and the ultraviolet light LED 5B, and the switch is turned off in accordance with the removal operation of the left side plate 2L, and the drive power supply Vuv for the ultraviolet light LED 5B is turned off. Supply is interrupted and ultraviolet light irradiation is stopped.
At this time, the switch 1C is used only for lighting control of the white light LED 5A, and the drive power Vuv is supplied to the ultraviolet light LED 5B by another system.

  Specifically, as shown in FIG. 7, the drive power supply Vuv may be supplied from the power supply circuit 5 by a system different from the drive power supply Vw, and the drive power supply Vw on the input side of the switch 1C is used as the drive power supply uv. (Power supply means). As a result, regardless of whether the white light LED 5A is turned on or off by the switch 1C, the operation light such as a commercial power supply is supplied and the ultraviolet light is always generated during the period when the case 2 and the left side plate 2L are completely fitted. The LED 5B can be turned on and ultraviolet light can be continuously irradiated.

  Therefore, even if the sterilization line irradiance of ultraviolet light is low, the sterilization dose obtained by multiplying the irradiance by the irradiation time can be increased, and a sufficient sterilization effect can be obtained. For this reason, a low-luminance type can be used as the ultraviolet light LED 5B, the cost of the surgical light itself can be reduced, and the life of the ultraviolet light LED 5B can be extended.

Thus, in this embodiment, the ultraviolet light LED 5B is provided inside the case of an electronic device such as a surgical light, and the case inside is sterilized by irradiating ultraviolet light inside the case. Compared to the case where a liquid disinfectant is used or the case where the electronic device is decomposed and irradiated with ultraviolet light, the inside of the electronic device can be sterilized easily and efficiently.
Under the present circumstances, LED which irradiates near ultraviolet light contained in sunlight among ultraviolet light as ultraviolet light LED5B may be used, and it can obtain comparatively cheaply and the bactericidal action similar to sunlight is obtained.

  In addition, since the case 6 of the electronic device is opened and closed, for example, the fitting state of the case 2 and the left side plate 2L is detected by the switch 6 and the power supply to the ultraviolet LED 5B is controlled, for example, the left side plate 2L is removed during maintenance. Even if it happens, the irradiation of ultraviolet light can be stopped automatically, and the influence on the human body can be suppressed.

  In addition, since the drive power is always supplied to the ultraviolet LED according to the supply of the operation power to the electronic device, the sterilization is performed by multiplying the irradiation time with the irradiance even if the ultraviolet light sterilization line irradiance is low. The dose can be increased and a sufficient sterilizing effect can be obtained. For this reason, a low-luminance type can be used as the ultraviolet light LED 5B, the cost of the surgical light itself can be reduced, and the life of the ultraviolet light LED 5B can be extended.

Further, the ultraviolet light 5B irradiates the inner chamber 2I formed by the substrate surface 4B of the printed circuit board 4 forming the electronic circuit of the electronic device and the inner side surface of the case 2 inside the case 2 with ultraviolet light. Therefore, the back side of the printed circuit board that is likely to form an environment in which various bacteria are likely to propagate can be intensively sterilized because a certain amount of heat is generated, and the inside of the electronic device can be sterilized efficiently.
At this time, if the electronic device is provided with an air cooling fan, the portion where dust is collected by the air cooling fan may be irradiated with ultraviolet light. Even when dust is carried from the outside to the inside of the device and collected at a specific location, where an environment where germs can easily propagate is formed, the specific location can be sterilized with emphasis and the inside of the electronic device can be efficiently Can be sterilized.

  Further, since the ultraviolet light LED 5B is disposed at the corner inside the case 2 and the ultraviolet light is irradiated toward the space inside the case, specifically, the central region 2J of the inner chamber 2I, the ultraviolet light is emitted from the inner chamber 2I. It is irradiated to every corner, and sterilization can be performed efficiently.

[Second Embodiment]
Next, with reference to FIG. 8, the shadowless lamp according to the second embodiment of the present invention will be described. FIG. 8 is a cross-sectional view of the surgical lamp according to the second embodiment of the present invention.
In the first embodiment, as illustrated in FIG. 2, the case where the back plate 2B of the case 2 has a flat plate shape has been described as an example. In the present embodiment, the inner side surface 2F of the back plate 2B has a recess (reflecting portion), and the entire back plate 2B has a dome shape that bulges toward the outside of the case 2.

Thereby, the ultraviolet light irradiated from the ultraviolet LED 5B is reflected by the concave portion of the inner side surface 2F and irradiated to every corner of the inner chamber 2I, so that the sterilization treatment can be performed efficiently.
At this time, the reflecting portion of the inner side surface 2F is not limited to the concave portion, and a known reflecting plate or reflecting film having a high ultraviolet light reflection efficiency may be provided on the inner side surface 2F. Thereby, even if it is flat plate shape as the back plate 2B, ultraviolet light can be irradiated to every corner of the inner chamber 2I, and sterilization can be performed efficiently.

[Third Embodiment]
Next, with reference to FIG. 9, the shadowless lamp concerning the 3rd Embodiment of this invention is demonstrated. FIG. 8 is a cross-sectional view of a surgical lamp according to a third embodiment of the present invention.
In the first embodiment, the case where the ultraviolet light LED 5B is mounted on the substrate surface 4B of the printed circuit board 4 on which the white light LED 5A is mounted has been described as an example. In the present embodiment, the ultraviolet LED 5B is mounted on a printed circuit board 4G that is separate from the printed circuit board 4, and the printed circuit board 4G is attached to the inner side surface 2F of the back plate 2B.

Thereby, the mounting work process of the ultraviolet light LED 5B can be performed separately from the mounting work process of the white light LED 5A, and the work process can be simplified.
As for power supply to the printed circuit board 4G, for example, a circuit connector may be provided between the printed circuit board 4 and the power may be supplied from the printed circuit board 4 to the printed circuit board 4G via the circuit connector.

  In each of the above embodiments, a surgical light has been described as an example of an electronic device. However, the present invention is not limited to this. For example, a monitor device that monitors a patient's biological state, an automatic infusion device that manages infusion, and the like. The present invention can also be applied to a large number of electronic devices used in medicine, and similar effects can be obtained.

1 is an external view of a surgical light according to a first embodiment of the present invention. It is a cross-sectional view of the shadowless lamp body according to the first embodiment of the present invention. It is a longitudinal cross-sectional view of the shadowless lamp body concerning the 1st Embodiment of this invention. It is explanatory drawing which shows arrangement | positioning of ultraviolet light LED. It is a graph which shows the relationship between the wavelength of light, and disinfection ability. It is an example of composition of a switch which detects a fitting state. 1 is a circuit diagram of a surgical lamp according to a first embodiment of the present invention. It is a cross-sectional view of the shadowless lamp concerning the 2nd Embodiment of this invention. It is a cross-sectional view of the shadowless lamp concerning the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Lamp body, 1A ... Handle, 1B ... Arm, 1C ... Switch, 2 ... Case, 2B ... Back plate, 2F ... Inner side surface, 2R ... Right side plate, 2L ... Left side plate, 2U ... Upper plate, 2D ... Lower plate 2I ... inner chamber, 2J ... central region, 3 ... opening, 3A ... mounting portion, 3B ... screw, 4 ... printed circuit board, 4A ... mounting surface, 4B ... board surface, 4C ... wiring cord, 5 ... power supply circuit 5A ... white light LED, 5B ... ultraviolet light LED, 6 ... switch, 6A ... lever, 7 ... filter, 8 ... lens, 8A ... convex, 9 ... cover.

Claims (11)

  An electronic device comprising: a case that houses an electronic circuit; and an ultraviolet LED that is provided inside the case and irradiates ultraviolet light inside the case. The electronic device according to claim 1,
The ultraviolet LED irradiates near ultraviolet light among ultraviolet light. The electronic device according to claim 1,
An electronic device further comprising a switch for detecting opening and closing of the case and controlling power supply to the ultraviolet LED. The electronic device according to claim 1,
An electronic apparatus further comprising power supply means for constantly supplying drive power to the ultraviolet LED in response to supply of operating power to the electronic circuit. The electronic device according to claim 1,
The ultraviolet light LED emits the ultraviolet light to an inner chamber formed by a surface of a printed circuit board on which the electronic circuit is mounted and an inner side surface of the case among the inner side of the case. The electronic device according to claim 1,
The said ultraviolet light LED irradiates the said ultraviolet light to the location where dust is collected by the air-cooling fan provided in the said electronic device among the said case inside. The electronic device according to claim 1,
The ultraviolet LED is disposed at a corner inside the case, and irradiates the ultraviolet light toward the space inside the case. The electronic device according to claim 1,
An electronic apparatus, further comprising: a reflection part configured to reflect ultraviolet light emitted from the ultraviolet LED into the case room. The electronic device according to claim 1,
The electronic device comprises a medical surgical lamp comprising a light source and a lens that illuminates an arbitrary affected area by collecting light emitted from the light source.   An electronic device sterilization method comprising irradiating ultraviolet light on the inside of the case with an ultraviolet LED provided inside the case of the electronic device. A printed circuit board mounted on the inside of the case and mounted with a plurality of white light LEDs used as a light source;
A lens mounted on the inside of the case, and having a convex portion for condensing the white light emitted from the white light LED and irradiating the outside of the case at a position facing each of the white light LEDs;
An operating light comprising: an ultraviolet light LED that irradiates ultraviolet light to an inner chamber formed by a substrate surface of the printed circuit board opposite to the mounting surface of the white light LED and an inner surface of the case. .

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