WO2019155763A1

WO2019155763A1 - Dryer

Info

Publication number: WO2019155763A1
Application number: PCT/JP2018/045962
Authority: WO
Inventors: 寿枝若林; 片山　秀昭; 学能勢; 大介山口; 亘祐松尾; 泰秀友寄
Original assignee: マクセルホールディングス株式会社
Priority date: 2018-02-07
Filing date: 2018-12-13
Publication date: 2019-08-15
Also published as: JP2019136191A; CN111148448A

Abstract

The purpose of the present invention is to prevent damage to an optical filter due to heat in a dryer having a light-emitting body, such as a halogen lamp, as a heat source. A body case 1 has a wind guide section 7 in which a blower fan 3 for delivering drying wind toward an outlet 9, a light-emitting body 4 as a heating source, and a reflector 10 for reflecting and guiding light emitted from the light-emitting body 4 toward the outlet 9 are disposed. A filter structure 11 for blocking the transmission of visible light is disposed in a light radiation path between the reflector 10 and the outlet 9. A substrate glass 62 of an optical filter 60 constituting the filter structure 11 is formed of a low-expansibility glass of either a crystallized glass or a quartz glass having a heat expansion coefficient of less than or equal to 7 × 10^-6.

Description

Hairdryer

The present invention relates to a dryer for drying hair or the like using infrared rays.

This type of dryer is disclosed, for example, in the dryer of Patent Document 1. The dryer described in Patent Document 1 includes a fan (blower fan), a heat ray light source, a reflector (reflector) covering the periphery of the heat ray light source, and a reflector inside a cylindrical main body (body case). A filter (optical filter) that closes the opening surface of the lens is provided. The heat ray light source is composed of a halogen lamp, an incandescent lamp, a xenon lamp, a metal halide lamp, or the like. By providing a filter on the opening surface of the reflector, it is possible to block most of the visible light out of the light (electromagnetic wave) emitted from the heat ray light source and transmit infrared light for heating the hair.

International Publication No. 2016/072031

According to the dryer of Patent Document 1, power consumption can be reduced compared to a dryer using a conventional nichrome wire heater as a heat source. Further, most of the visible light out of the light emitted from the heat ray light source can be blocked by a filter, so that dazzling light can be eliminated from the eyes of the user when the hair is dried. However, when the dryer is used continuously, heat may accumulate in the filter, which may cause rapid expansion and breakage, and there is a risk that the fingertip touches the filter facing the outlet and may be burned. There are problems with durability and safety. If the filter is damaged by overheating, the filter debris may scatter from the outlet and cause injury.

An object of the present invention is to provide a dryer that can reliably prevent damage to an optical filter due to heat even when the dryer is continuously used, and thus has excellent durability.
An object of the present invention is to provide a dryer that is excellent in safety so that even if the fingertip accidentally enters the inside of the air outlet, the fingertip does not touch the optical filter and cause burns.

The dryer according to the present invention includes a blower fan 3 that feeds dry air toward the air outlet 9 inside the air guide portion 7 of the main body case 1, a light emitter 4 that serves as a heating source, and radiation from the light emitter 4. A reflector 10 that reflects and guides the emitted light toward the outlet 9 is disposed. In the light emission path between the reflector 10 and the air outlet 9, a filter structure 11 that blocks transmission of visible light out of the light emitted from the light emitter 4 is disposed. The substrate glass 62 of the optical filter 60 constituting the filter structure 11 is characterized by being formed of low expansion glass.

The substrate glass 62 is made of low-expansion glass, either crystallized glass or quartz glass, having a thermal expansion coefficient smaller than 7 × 10 ⁻⁶ . Examples of the crystallized glass include black crystallized glass and transparent crystallized glass. In the case of the substrate glass 62 formed of quartz glass or transparent crystallized glass, a multilayer film 71 is formed on one side thereof to form an optical layer. The filter 60 is used.

The optical filter 60 includes a substrate glass 62 formed of low expansion quartz glass or transparent crystallized glass, and a multilayer film 71 laminated on one surface of the substrate glass 62.

The optical filter 60 is disposed in a state where the multilayer film 71 is positioned on the light exit surface side of the substrate glass 62.

The substrate glass 62 is formed of black crystallized glass in which β-quartz solid solution crystals are precipitated in the glass.

A plurality of optical filters 60 are arranged adjacent to each other in the light emission path between the reflector 10 and the air outlet 9 with a gap E therebetween.

The filter structure 11 includes an optical filter 60 and a translucent member 61 disposed in a light emission path between the optical filter 60 and the outlet 9. The translucent body 61 is formed of a translucent material that allows infrared light to pass through the optical filter 60.

In the dryer of the present invention, the filter structure 11 that blocks the transmission of visible light is disposed in the light emission path between the reflector 10 and the air outlet 9, and the substrate glass 62 of the optical filter 60 that constitutes the filter structure 11 has a low expansion property. It was made to form with glass. According to such a dryer, it is possible to prevent the substrate glass 62 from being thermally expanded by receiving the heat of the radiated light from the light emitter 4 as much as possible. Therefore, even when the dryer is used continuously, it is possible to reliably prevent the optical filter 60 from being damaged by heat and provide a dryer having excellent durability.

If the substrate glass 62 is formed of low-expansion crystallized glass or quartz glass having a thermal expansion coefficient smaller than 7 × 10 ⁻⁶ , heat accumulates in the substrate glass 62, and the substrate glass 62 rapidly expands and breaks. Can be more reliably prevented. The upper limit value of the thermal expansion coefficient of crystallized glass or quartz glass forming the substrate glass 62 is set to 7 × 10 ⁻⁶ based on the following verification results. In the verification, a substrate glass formed of white glass having a thermal expansion coefficient of 7.6 × 10 ⁻⁶ and a plurality of layers such as TiO ₂ / SiO ₂ and Nb ₂ O ₅ / SiO ₂ are laminated on one side. An optical filter for comparison was formed with the multilayered film, and the thermal characteristics of the optical filter for comparison and the optical filter 60 in which the substrate glass 62 was formed of the above-mentioned crystallized glass or quartz glass were verified under the same conditions. . As a result of the verification, when the substrate glass 62 is an optical filter 60 formed of a low-expansion crystallized glass having a thermal expansion coefficient smaller than 7 × 10 ⁻⁶ or quartz glass, no change in appearance was observed. However, it was found that the comparative optical filter was damaged by heating. From the above verification results, the upper limit value of the thermal expansion coefficient of crystallized glass or quartz glass forming the substrate glass 62 was set to 7 × 10 ⁻⁶ .

When the optical filter 60 includes a substrate glass 62 formed of low-expansion quartz glass or transparent crystallized glass and a multilayer film 71 laminated on one surface of the substrate glass 62, the substrate glass 62 of the optical filter 60 is Compared with the case of forming with black crystallized glass, the transmittance of infrared light can be increased. Therefore, the amount of heat delivered from the dryer is increased by the amount of the high infrared light transmittance, so that the hair can be heated and dried or the human body can be effectively dried. Further, the optical filter 60 composed of the substrate glass 62 formed of low-expansion quartz glass or transparent crystallized glass and the multilayer film 71 blocks the visible light by the reflection action of the multilayer film 71, and therefore the substrate glass 62. There is almost no absorption of light, such as visible light, and therefore there is no accumulation of heat associated with the absorption of light, so that there is an advantage that damage to the optical filter 60 due to heat can be prevented more reliably. The visible light reflected by the multilayer film 71 also helps to increase the temperature of the filament of the bulb 38 of the illuminant 4 and is advantageous in that it can reduce power consumption of the filament and save power. Furthermore, by changing the multilayer structure of the multilayer film 71 and the physical properties of the multilayer film, it is possible to change the cut wavelength of visible light and transmit part of the visible light. The color can be red or white.

When the optical filter 60 is composed of a substrate glass 62 formed of low expansion quartz glass or transparent crystallized glass and a multilayer film 71 laminated on one side of the substrate glass 62, the multilayer film 71 is formed of the substrate glass 62. The optical filter 60 is disposed in a state of being located on the exit surface side. This is because the incident surface side of the substrate glass 62 has a higher temperature than the exit surface side, and the substrate glass is disposed by arranging the optical filter 60 in a state where the multilayer film 71 is located on the exit surface side of the substrate glass 62. This is because 62 and the multilayer film 71 can be prevented from falling into an overheated state. In the case where the optical filter 60 is disposed in a state where the multilayer film 71 is located on the incident surface side, the multilayer film 71 is heated and deteriorated, and the visible light reflection function may be impaired.

When the optical filter 60 is formed by forming the substrate glass 62 from black crystallized glass in which β-quartz solid solution crystals are precipitated in the glass, visible light is absorbed by the solid solution crystals to prevent visible light transmission. it can. Further, the temperature of the optical filter 60 tends to increase due to the heat absorption effect and the heat radiation effect of the solid solution crystal. Therefore, by supplying the dry air supplied from the blower fan 3 to the periphery of the optical filter 60, the temperature of the dry air can be raised to effectively heat and dry the hair or dry the human body. it can.

When a plurality of optical filters 60 are disposed adjacent to the light emission path between the reflector 10 and the air outlet 9 with a gap E therebetween, one of the dry winds fed along the periphery of the reflector 10 is provided. The optical filter 60 can be forcibly cooled with dry air by introducing the portion into the gap E. According to such a dryer, even when the dryer is continuously used, the optical filter 60 can be reliably prevented from being damaged due to being overheated. In addition, by introducing a part of the drying air into the gap E, the contact between the drying air and each optical filter 60 can be increased and the temperature of the drying air can be increased. Etc. can be performed effectively in a short time.

The filter structure 11 is configured by the optical filter 60 and the translucent member 61 arranged in the light emission path between the optical filter 60 and the air outlet 9. Further, the light transmitting body 61 is formed of a light transmitting material that allows infrared light to pass therethrough. According to such a dryer, it is possible to prevent the finger or foreign matter that has entered the air guide 7 from the air outlet 9 from coming into contact with the optical filter 60 by the translucent body 61, so that the fingertip accidentally enters the air outlet 9. Even if there is a case, it is possible to obtain a highly safe dryer in which the fingertip does not touch the optical filter 60 and cause burns.

It is a vertical side view of the principal part of the dryer which concerns on Example 1 of this invention. 1 is a perspective view of a dryer according to Embodiment 1. FIG. It is a vertical side view of the dryer which concerns on Example 1. FIG. FIG. 2 is a cross-sectional view taken along line AA in FIG. It is a vertical side view of the principal part of the dryer which concerns on Example 2 of this invention. It is a vertical side view of the principal part of the dryer which concerns on Example 3 of this invention. It is a vertical side view of the principal part of the dryer which concerns on Example 4 of this invention. It is a vertical side view of the principal part of the dryer which concerns on Example 5 of this invention.

(Example 1) FIG. 1 thru | or FIG. 4 shows Example 1 which applied the dryer concerning this invention to the hair dryer. In the present embodiment, front and rear, left and right, and up and down follow the cross arrows shown in FIG. In FIGS. 2 and 3, the hair dryer includes an axial blower fan 3 that is rotationally driven by a fan motor 2 and a halogen lamp (light emitter) serving as a heating source inside a main body case 1 that is long before and after serving as a grip. 4 etc. are accommodated. The main body case 1 includes a cylindrical air guide portion 7 formed by joining a pair of upper and lower halves 5 and 6 formed in a bowl shape. Air is sucked into the rear end of the air guide portion 7. A mouth 8 is formed, and an air outlet 9 is formed at the front end.

The blower fan 3 is disposed in the latter half of the main body case 1 and pressurizes air sucked from the suction port 8 and feeds it toward the blower port 9. The halogen lamp 4 is disposed in the front half of the main body case 1, and a reflector 10 that reflects and guides light emitted from the halogen lamp 4 toward the outlet 9 is fixed around the halogen lamp 4. A filter structure 11 is disposed in the light emission path between the reflector 10 and the outlet 9. The air outlet 9 serves as an air outlet for irradiating the user's hair with infrared air (heat rays) radiated from the halogen lamp 4 and a dry air outlet.

Most of the peripheral surface of the main body case 1 is covered with a touch sensor 12 that detects contact with a human body, and an operation knob 15 of a power switch 14 is arranged facing an operation unit formed on the upper part of the touch sensor 12. ing. When the operation knob 15 is slid back and forth along the surface of the main body case 1, the power switch 14 can be switched between an on state and an off state. As shown in FIG. 3, the power switch 14 is housed in a housing recess 17 formed in the upper portion of the main body case 1, and the fan motor 2 and the halogen lamp are provided in the housing recess 18 formed in the lower portion of the main body case 1. A control board 19 for controlling the driving state of 4 is accommodated.

A suction grill 22 is attached to the suction port 8 of the main body case 1, and a socket 25 for detachably connecting a power supply plug 24 is provided at the center of the suction grill 22. A blowout grill 23 made of a metal material such as aluminum is attached to the blowout opening 9 of the main body case 1. The blow-out grill 23 is integrally provided with a cylindrical outer cylindrical body 26 and an inner cylindrical body 27, and a plurality of rectifying blades 28 that radially connect both

cylindrical bodies

26 and 27.

As shown in FIG. 3, the fan motor 2 and the blower fan 3 are supported by a fan case 29. The fan case 29 includes a cylindrical outer cylinder 30 surrounding the blower fan 3, a holder portion 31 to which the rear end portion of the fan motor 2 is mounted, and a cylindrical inner cylinder surrounding the holder portion 31. 32 and a plurality of rectifying blades 33 that radially connect the outer cylindrical body 30 and the inner cylindrical body 32 are integrally provided. A flange 34 projects outwardly from the front end of the outer cylindrical body 30, and the fan case 29 is formed by engaging and holding the flange 34 with an engagement groove 35 formed on the inner surface of the halves 5 and 6. It is fixed to the main body case 1.

The halogen lamp 4 is configured by connecting a bulb 38 enclosing a filament, an inert gas, a halogen gas, and the like and a housing 39 in the front and rear directions. When the halogen lamp 4 is turned on, visible light and infrared light are emitted from the bulb 38. A light collecting reflector 10 is disposed around the bulb 38. The reflector 10 is made of a metal such as aluminum as a material and is formed in a round bottom cylindrical shape that opens toward the air outlet 9, and a reflection film is formed on the inner surface thereof. An insertion hole 43 for allowing the valve 38 to face the inside of the reflector 10 is formed in the center of the rear portion of the reflector 10. On the outer peripheral surface of the front edge (opening periphery) of the reflector 10, a ring-shaped flange 44 that reinforces the front edge is projected outward (see FIG. 1). Engaging recesses 45 are formed at four locations on the upper, lower, left, and right sides of the outer peripheral surface of the flange 44. By engaging the support frame 47 with the engaging recesses 45, the reflector 10 can be supported in a stable posture.

The support frame 47 is formed by assembling a pair of

mica plates

48 and 49 orthogonally (see FIGS. 1 and 4), and the reflector 10 and the housing 39 of the halogen lamp 4 are supported by the support frame 47. The support frame 47 also serves as a rectifier for wind generated by the blower fan 3, and supports the front half of the fan motor 2 from four directions (up, down, left and right). The rear end portions of the

mica plates

48 and 49 are inserted and engaged with slits 50 provided in the front end portion of the fan case 29 (see FIG. 3), thereby restricting the rotation of the support frame 47 with respect to the main body case 1. Has been. A shallow mounting groove 57 is formed in the inner surface of the front end portion of the main body case 1 in a circular shape, and the outer cylindrical body 26 of the blowing grill 23 is fitted into the mounting groove 57, whereby the main body of the blowing grill 23. The forward / backward direction (axial direction) and radial movement relative to the case 1 are restricted.

In FIG. 1, the filter structure 11 includes two optical filters 60 disposed in the light radiation path between the reflector 10 and the blower outlet 9, and a light transmission path disposed in the light radiation path between the front optical filter 60 and the blower outlet 9. The light body 61 is used. The optical filter 60 includes a disk-shaped substrate glass 62 formed of low-expansion glass and a ring-shaped holder 63 that supports the substrate glass 62. The substrate glass 62 is preferably formed of crystallized glass or quartz glass having a thermal expansion coefficient smaller than 7 × 10 ⁻⁶ , and in this embodiment, the substrate glass 62 is made of β-quartz solid solution crystal in the glass. It was formed from the precipitated black crystallized glass (crystallized glass), and the two optical filters 60 were adjacent to each other with a gap E therebetween. The thermal expansion coefficient of black crystallized glass is 7 × 10 ⁻⁷ , and the transmittance of light (electromagnetic wave) having a wavelength of 600 nm or less in the visible light region is 50% or less. The gap E is preferably 2 mm or more. In this embodiment, the gap E is 10 mm.

As described above, when the substrate glass 62 is formed of black crystallized glass having a thermal expansion coefficient smaller than 7 × 10 ⁻⁶ , an optical filter 60 having excellent heat resistance and strength and excellent thermal shock resistance can be obtained. Can do. Since the black crystallized glass absorbs visible light by the β-quartz solid solution crystal precipitated in the glass, the amount of visible light absorbed by the substrate glass 62 can be increased as the thickness thereof increases. In this embodiment, the thickness of the substrate glass 62 is 3 mm, and the front and rear optical filters 60 cooperate to absorb most of the visible light. The thickness of the substrate glass 62 is preferably selected in the range of 0.8 to 6 mm. If the thickness of the substrate glass 62 is less than 0.8 mm, the strength of the substrate glass 62 is insufficient and there is a problem with durability. For example, the substrate glass 62 is damaged when receiving a drop impact. On the other hand, if the thickness of the substrate glass 62 exceeds 6 mm, the weight of the optical filter 60 increases, and the weight of the optical filter 60 is increased when the hair dryer is used.

Gap E1 and E2 similar to the above gap E are also provided between the rear optical filter 60 and the reflector 10 and between the front optical filter 60 and the light transmitting body 61. The gaps E1 and E2 are preferably 0.5 mm or more. In this embodiment, the gap E1 is 1 mm and the gap E2 is 10 mm. The halogen lamp 4 emits electromagnetic waves (visible light and infrared light) having a wavelength of 400 to 3000 nm. As described above, visible light having a wavelength of 600 nm or less of the emitted light of the halogen lamp 4 is Absorption occurs while passing through the two optical filters 60. As described above, when visible light is absorbed by the two optical filters 60, the degree of absorption of visible light in the filter structure 11 can be significantly improved as compared with the case where visible light is absorbed by only one optical filter 60. Therefore, when using a hair dryer, it is possible to reliably prevent visible light from being radiated from the air outlet 9 of the dryer, so that dazzling light can be prevented from entering the user's eyes when the hair is dried, etc. The hair styling work can be performed smoothly without causing it to occur.

As described above, the optical filter 60 is disposed adjacent to the gap E, and the gaps E1 and E2 are provided between the optical filter 60 and the reflector 10 and between the optical filter 60 and the light transmitting body 61. In addition, a part of the drying air fed along the periphery of the reflector 10 is introduced into the gaps E, E1, and E2, and the substrate glass 62 and the translucent body 61 are reliably prevented from falling into an overheated state. However, it is possible to increase the temperature of the drying air by increasing the chance of contact between the drying air and each optical filter 60. Incidentally, when the two optical filters 60 are arranged adjacent to each other without a gap, heat is accumulated on the adjacent surface of the substrate glass 62 and is likely to fall into an overheated state, thereby exhibiting sufficient thermal shock resistance. It becomes difficult.

The translucent member 61 includes a disk-shaped substrate glass 64 formed of a transparent glass material (translucent material) that allows infrared light to pass therethrough, and a ring-shaped holder 65 that supports the substrate glass 64. Yes. The holder 63 of the optical filter 60 and the holder 65 of the translucent body 61 are each made of a metal material such as aluminum and formed as a ring larger than the peripheral surface diameter of the reflector 10. Engaging

recesses

66 and 67 are formed at four locations on the surface. The

mica plates

48 and 49 are formed with holding

recesses

68 and 69 that engage with the

holders

63 and 65, respectively, and the previous engagement recesses 66 and 67 engage with the recessed walls of the holding recesses 68 and 69. As a result, the optical filter 60 and the translucent body 61 are fixedly held by the support frame 47 so as not to move in all directions. Note that the front surface of the holder 65 of the translucent body 61 is received by the inner cylindrical body 27 of the outlet grill 23. In this way, by arranging the translucent member 61 on the rear surface of the blowout grill 23, a finger or a foreign object that has entered the air guide 7 from the blowout port 9 while allowing the infrared light to pass through the optical filter 60 is allowed. Can be prevented by the translucent body 61 from contacting the optical filter 60. Therefore, it is possible to reliably prevent the fingertip from accidentally contacting the optical filter 60 and improve the safety of the hair dryer.

The control unit mounted on the control board 19 controls the drive current supplied to the halogen lamp 4 and the fan motor 2 based on the state of the power switch 14 and the touch sensor 12. For example, when the power switch 14 is in the on state and the finger sensor touches the touch sensor 12, the control unit supplies drive current to the halogen lamp 4 and the fan motor 2. When the power switch 14 is switched to the OFF state or when the touch sensor 12 is in a non-detection state where the human body is not detected, the control unit stops supplying drive current to the halogen lamp 4 and the fan motor 2.

However, even if the power switch 14 is switched from the off state to the on state in the non-detection state of the touch sensor 12, and the touch sensor 12 subsequently enters the detection state, the control unit supplies drive current to the halogen lamp 4 and the fan motor 2. Do not supply. This is because, for example, when a user who does not notice that the power switch 14 is in the on state picks up the main body case 1 to move the hair dryer, the touch sensor 12 is in the detection state. Then, the halogen lamp 4 is turned on against the user's intention and the fan motor 2 is started, which surprises the user.

In the hair dryer of Example 1 configured as described above, the substrate glass 62 of the optical filter 60 of the filter structure 11 is formed of low expansion glass having excellent heat resistance and strength and excellent thermal shock resistance. . In addition, a part of the drying air fed along the periphery of the reflector 10 is introduced into the gap E and the gaps E1 and E2 before and after the filter structure 11, so that the optical filter 60 and the translucent body 61 are dried with air. It was possible to forcibly cool. According to such a hair dryer, even when the hair dryer is used continuously, it is possible to reliably prevent the optical filter 60 and the translucent body 61 from being overheated and damaged. Even if the fingertip accidentally enters the inside of the air outlet 9, the fingertip can be prevented from touching the high-temperature optical filter 60 with the translucent body 61, and the user is not burned. As a hair dryer with excellent durability and safety. Furthermore, by introducing a part of the drying air into the gaps E, E1, and E2, the contact opportunity between the drying air and each optical filter 60 can be increased and the temperature of the drying air can be increased. Can be effectively performed in a short time.

(Example 2) FIG. 5 shows Example 2 of the dryer according to the present invention in which a part of the filter structure 11 is changed. In the second embodiment, a single optical filter 60 disposed in the light radiation path between the reflector 10 and the outlet 9, and a translucent member 61 disposed in the light radiation path between the optical filter 60 and the outlet 9. The point which comprises the filter structure 11 differs from the filter structure 11 of Example 1. FIG. The structure of the optical filter 60 is basically the same as that of the optical filter 60 of the first embodiment, but differs from the optical filter 60 of the first embodiment in that the thickness of the substrate glass 62 is 6 mm. Further, gaps E1 and E2 are provided between the optical filter 60 and the reflector 10 and between the optical filter 60 and the light transmitting body 61. Since others are the same as those of the first embodiment, the same members are denoted by the same reference numerals and the description thereof is omitted. The same applies to the following embodiments.

As described above, when the filter structure 11 is constituted by one optical filter 60 and the light transmitting body 61, the filter structure 11 can be simplified by the amount that the number of components can be reduced, and the space between the reflector 10 and the outlet 9 can be reduced. By reducing the interval, a compact hair dryer can be provided in which the front and rear length of the main body case 1 is reduced accordingly. In addition, since the substrate glass 62 is formed of black crystallized glass having a thickness of 6 mm, it is the same level as the filter structure 11 of the first embodiment even though the optical filter 60 absorbs visible light. Visible light can be absorbed.

Example 3 FIG. 6 shows Example 3 in which a part of the filter structure 11 is changed. In Example 3, the substrate glass 62 is formed of low-expansion quartz glass having a thermal expansion coefficient smaller than 7 × 10 ⁻⁶ , and TiO ₂ / SiO ₂ or Nb ₂ O ₅ is formed on one surface of the substrate glass 62. A multilayer film 71 was formed by laminating a plurality of layers such as / SiO ₂ . The multilayer film 71 transmits infrared light but reflects visible light. The thickness of the substrate glass 62 was set to 3 mm, and the multilayer film 71 was arranged in a state of being located on the emission surface side. This is because the incident surface side of the substrate glass 62 has a higher temperature than the exit surface side, and the substrate glass is disposed by arranging the optical filter 60 in a state where the multilayer film 71 is located on the exit surface side of the substrate glass 62. 62 and the multilayer film 71 can be prevented from falling into an overheated state. As described above, in the case of the optical filter 60 in which the multilayer film 71 is formed on one side, it is preferable that the multilayer film 71 is disposed in a state of being located on the emission surface side. When the optical filter 60 is disposed in a state where the multilayer film 71 is located on the incident surface side, the multilayer film 71 may be heated and deteriorated, and the reflective function of visible light may be impaired. However, the optical filter 60 may be arranged in a state where the multilayer film 71 is located on the incident surface side according to the distance of the optical filter 60 from the halogen lamp 4 or the difference in arrangement form. The substrate glass 62 may be formed of a low-expansion transparent crystallized glass having a thermal expansion coefficient smaller than 7 × 10 ^{−6 in place} of the low-expansion quartz glass. 62 should just have the transmittance | permeability of the light (electromagnetic wave) of a wavelength of 600 nm or less 50% or more.

As described above, when the optical filter 60 includes the substrate glass 62 formed of low-expansion quartz glass or transparent crystallized glass, and the multilayer film 71 laminated on one surface of the substrate glass 62, the optical filter 60 Compared with the case where the substrate glass 62 is formed of black crystallized glass, the infrared light transmittance can be increased. Therefore, the amount of heat delivered from the dryer can be increased by the amount of high infrared light transmission, and hair can be heated and dried, or the human body can be effectively dried. And an optical filter 60 excellent in thermal shock resistance can be obtained. In addition, the optical filter 60 composed of the substrate glass 62 formed of low-expansion quartz glass or transparent crystallized glass and the multilayer film 71 blocks visible light by the reflective action of the multilayer film 71, so that visible light, etc. Therefore, the optical filter 60 can be more reliably prevented from being damaged by heat because there is no heat accumulation due to the light absorption. Visible light reflected by the multilayer film 71 also helps to increase the temperature of the filament of the bulb 38, which is advantageous in that the power consumption of the filament can be reduced and power can be saved. Furthermore, by changing the multilayer structure of the multilayer film 71 and the physical properties of the multilayer film, it is possible to change the cut wavelength of visible light and transmit part of the visible light. The color can be red or white.

Example 4 FIG. 7 shows Example 4 in which a part of the filter structure 11 is changed. In the fourth embodiment, like the filter structure 11 of the second embodiment, the filter structure 11 is composed of one optical filter 60 and a light transmitting body 61, but the thickness of the substrate glass 62 is 3 mm. Different from the second optical filter 60.

As described above, when the filter structure 11 is constituted by one optical filter 60 and the light transmitting body 61, the filter structure 11 can be simplified by the amount that the number of components can be reduced, and compared with the filter structure 11 of the second embodiment. Thus, the distance between the reflector 10 and the air outlet 9 can be further reduced, and the longitudinal length of the main body case 1 can be reduced by that much, and the hair dryer can be made more compact.

(Example 5) FIG. 8 shows Example 5 in which a part of the filter structure 11 is changed. In Example 5, the filter structure 11 was constituted by one optical filter 60 disposed on the rear surface of the blow grill 23. Further, the substrate glass 62 of the optical filter 60 is formed of a low-expansion quartz glass having a thermal expansion coefficient smaller than 7 × 10 ⁻⁶ , similarly to the substrate glass 62 of Example 3, and on one side of the substrate glass 62, A multilayer film 71 was formed by laminating a plurality of layers of TiO ₂ / SiO ₂ or Nb ₂ O ₅ / SiO ₂ . Such a filter structure 11 can minimize the number of components, simplify the filter structure 11, and further reduce the manufacturing cost. The substrate glass 62 in this embodiment may be formed of a low-expansion transparent crystallized glass having a thermal expansion coefficient smaller than 7 × 10 ⁻⁶ , similar to the substrate glass 62 of the third embodiment.

In each of the above embodiments, the light emitter 4 can be composed of an incandescent lamp, a xenon lamp, a metal halide lamp, etc. in addition to the halogen lamp. The touch sensor 12 can be omitted. In this case, the power switch 14 is switched to cool only the blower fan 3 and the cold air mode that drives the blower fan 3 and the light emitter 4 at the same time. It is possible to switch to a high temperature and strong wind mode where the air volume is higher than the wind mode and the air volume is large. The main body case 1 can be formed in an elliptical cylindrical shape or a polygonal cylindrical shape in addition to the cylindrical shape, and a foldable grip may be provided on the lower surface side of the main body case 1 as necessary. The present invention can be applied not only to humans but also to dryers for animals such as dogs and cats.

1 Body case 3 Blower fan 4 Halogen lamp (light emitter)
7 Air guide portion 8 Suction port 9 Air outlet 10 Reflector 11 Filter structure 38 Valve 60 Optical filter 61 Translucent member 62 Substrate glass 63 Holder 71 Multilayer film

Claims

A blower fan (3) that feeds dry air toward the air outlet (9), an illuminant (4) that serves as a heating source, and an illuminant inside the air guide (7) of the main body case (1) A reflector (10) for reflecting and guiding the light emitted from (4) toward the outlet (9) is disposed,
In the light emission path between the reflector (10) and the air outlet (9), a filter structure (11) that blocks transmission of visible light out of the light emitted from the light emitter (4) is disposed.
A dryer characterized in that the substrate glass (62) of the optical filter (60) constituting the filter structure (11) is formed of low expansion glass.
The dryer according to claim 1, wherein the substrate glass (62) is formed of one of low-expansion glass of crystallized glass and quartz glass having a thermal expansion coefficient smaller than 7 × 10 -6 .
The optical filter (60) is composed of a substrate glass (62) formed of low-expansion quartz glass or transparent crystallized glass, and a multilayer film (71) laminated on one side of the substrate glass (62). The dryer according to 1 or 2.
The dryer according to claim 3, wherein the optical filter (60) is arranged in a state in which the multilayer film (71) is positioned on the emission surface side of the substrate glass (62).
The dryer according to claim 1 or 2, wherein the substrate glass (62) is formed of black crystallized glass in which β-quartz solid solution crystals are precipitated in the glass.
6. The optical radiation path between the reflector (10) and the air outlet (9), wherein a plurality of optical filters (60) are disposed adjacent to each other with a gap (E) therebetween. As described in the dryer.
The filter structure (11) is composed of an optical filter (60), and a translucent body (61) arranged in a light emission path between the optical filter (60) and the air outlet (9).
The dryer according to any one of claims 1 to 6, wherein the translucent body (61) is formed of a translucent material that allows infrared light to pass through the optical filter (60).