JP3158453U - Light irradiation device - Google Patents

Abstract

In a light irradiation apparatus using a light emitting diode, an object to be irradiated can be efficiently irradiated with light emitted at a wide angle from an LED chip without increasing the size of a head portion that houses the light emitting diode. A possible light irradiation device is provided. Light emitted from a light emitting surface 111a of an LED chip 111 is reflected by a reflecting surface 112a so as to be a substantially parallel light beam, enters a light exiting lens 16a, and the direction of the axis X on the light exiting surface of the light exiting lens 16a. The light is refracted and condensed on the irradiated region W1. [Selection] Figure 2

Description

  The present invention relates to a light irradiation apparatus provided with a light emitting element, and specifically relates to a configuration suitable for miniaturization and efficiency improvement of the light irradiation apparatus.

  Conventionally, a light irradiation apparatus used for irradiating a photocurable resin with ultraviolet rays or visible light having a wavelength in the 400 nm range uses a discharge lamp such as a mercury xenon lamp or a halogen lamp as a light source. Light emitted from these light sources is guided by a light guide in which a number of optical fiber strands are bundled, and irradiated to a photocurable resin that is an object to be irradiated. In recent years, a light irradiation apparatus using a light emitting diode as a light source as a light emitting element is becoming widespread for the purpose of downsizing the apparatus and reducing power consumption.

  Such a light irradiation device generally has a configuration in which a head unit that houses the light emitting diode and a control unit that includes a power source for supplying power to the head unit are connected by a cable. There is known one in which a plurality of head portions can be connected to one control portion.

  In the process of assembling an optical product such as a pickup lens or a camera lens using such a light irradiation device having a plurality of head parts, the plurality of head parts are usually provided with a plurality of coatings coated with a photocurable resin. Light is irradiated to the irradiation region. For this reason, the plurality of head portions are required to be as small as possible in size so that the head portions do not interfere with each other.

  In addition, even when photocuring resin is cured using a single head, a light irradiation device using a light emitting diode as a light source is used as a replacement for a conventional light irradiation device using a light guide. Often. For this reason, the dimension of the head part is required to be the same as or smaller than the dimension of the light emitting end part of the conventional light guide.

  In order to meet such a demand, the head unit is generated by turning on the light emitting diode or an optical component for collecting the light emitted from the light emitting diode and irradiating the irradiated object in addition to the light emitting diode. Each component such as a heat radiating means for dissipating heat is arranged inside a cylindrical or prismatic housing along its central axis. Patent Document 1 and Patent Document 2 disclose a light irradiation apparatus having a head portion having such a structure, and the head portion is miniaturized.

  FIG. 8A is a schematic diagram for explaining the optical structure of the head portion of the light irradiation apparatus shown in Patent Document 1. FIG.

  In FIG. 8A, the light emitting element is a light emitting diode 81 and includes an LED chip 811 as a light emitter.

  The LED chip 811 is disposed in the recess 812 a of the base 812 in a direction in which the light emitting surface 811 a faces the irradiated region W. A part L1 of the light beam diffused and radiated from the light emitting surface 811a is converted into a substantially parallel light beam by the first lens 82 and then condensed in a spot shape by the second lens 83 in the irradiated region W.

However, since the light emitting surface of the light emitting diode is normally a substantially uniform diffusing surface, the luminous flux emitted from the light emitting surface 811a diverges in a range of up to about 90 degrees around the axis X orthogonal to the light emitting surface 811a. have.
The light beam emitted from the light emitting surface 811a is also emitted to a region other than the range that can be captured by the first lens 82, and the light beam L2 outside the range of the first lens 82 Since the light is not condensed on the irradiation region W, there is a problem that it is consumed without being effectively used for curing the photocurable resin.

  As a method for capturing the light beam L2 radiated at such a wide angle into the first lens 82, a method of increasing the diameter of the first lens 82 and the second lens 83 as shown in FIG. 8B. Is also possible. However, when such a method is adopted, the outer shape of the head portion of the light irradiation device itself becomes large. For example, when a plurality of head portions are arranged and used in a limited range, adjacent head portions interfere with each other. For this reason, the light irradiation device using a light emitting diode as a light source has a problem that the light irradiation device using a light guide is remarkably inferior to a conventional light irradiation device.

JP-A-2005-181878 JP 2006-281130 A

  The present invention has been made to solve such a problem. In a light irradiation device using a light emitting diode, the present invention is wider than the LED chip without increasing the outer shape of the head portion accommodating the light emitting diode. Provided is a light irradiation device capable of efficiently irradiating an irradiation object with light emitted at an angle.

This invention solves the said subject by providing the light irradiation apparatus using a light emitting diode.
A light irradiation apparatus according to a first aspect includes a light emitting diode including an LED chip that emits light, a concave mirror including a reflective surface that reflects light, and a housing that houses the LED chip and the concave mirror. The irradiated object is irradiated with the light emitted from. And a light irradiation apparatus arrange | positions the light emission surface of a LED chip facing the reflective surface of a concave mirror.
With this configuration, the light irradiation device of the first aspect can dramatically improve the utilization efficiency of the light emitted from the LED chip. In addition, the power supplied to the light emitting diode can be reduced.

The light irradiation device according to the second aspect is a reflective light emitting diode in which the light emitting diode is integrally formed with an LED chip and a concave mirror.
With this configuration, the light irradiation device according to the second aspect can easily handle the LED chip and the concave mirror.

In the light irradiation device according to the third aspect, the LED chip is disposed inside the concave mirror from the opening end of the concave mirror.
With this configuration, the light irradiating device according to the third aspect can effectively utilize a light beam tilted by 90 degrees or more from the central axis radiated from the LED chip.

In a fourth aspect, the concave mirror includes a rotating paraboloid on its reflecting surface, and the light emitting surface of the LED chip is disposed at the focal position of the rotating paraboloid.
With this configuration, the light irradiation device according to the fourth aspect can easily convert the light beam emitted from the LED chip into a parallel light beam (coherent light).

The light irradiation apparatus of the 5th viewpoint has a lens unit provided with the lens for condensing the light radiated | emitted from the LED chip with respect to the to-be-irradiated object in the spot form in the light emission part of the housing.
With this configuration, the light irradiation device of the fifth aspect can adjust the focal position to the position of the irradiated object.

In the light irradiation device of the sixth aspect, the lens unit is detachably attached to the housing.
With this configuration, the irradiation distance can be freely changed according to the position of the irradiated object.

In the light irradiation device of the seventh aspect, a plurality of LED chips are arranged on the same plane, and light emitted from the plurality of LED chips is collected by the same lens unit.
With this configuration, the light irradiation apparatus can collect light from the plurality of LED chips on the irradiation object with the same lens.

In the light irradiation device according to the eighth aspect, one or more LED chips out of the plurality of LED chips emit light having a central wavelength different from the light emitted from the other LED chips.
Since light of different wavelengths can be condensed on the irradiated object, it is effective when applied to, for example, an ultraviolet curable adhesive.

In the light irradiation device according to the ninth aspect, the concave mirror includes a spheroid on its reflecting surface, and the light emitting surface of the LED chip is disposed at the focal position of the spheroid.
With this configuration, the light from the LED chip can be condensed on the irradiated object without using an optical lens.

  According to the present invention, in a light irradiation device using a light emitting diode, an object to be irradiated is efficiently irradiated with light emitted at a wide angle from an LED chip without increasing the size of the head portion that houses the light emitting diode. It is possible to provide a light irradiation apparatus capable of performing the above.

It is a block diagram of the light irradiation apparatus which concerns on the 1st embodiment of this invention. It is sectional drawing which shows the head part of the light irradiation apparatus which concerns on the 1st embodiment of this invention. It is a graph which shows the directional characteristic of a LED chip. It is sectional drawing which shows the modification of the head part of the light irradiation apparatus which concerns on the 1st embodiment of this invention. It is sectional drawing which shows the modification of the head part of the light irradiation apparatus which concerns on the 1st embodiment of this invention. It is sectional drawing which shows the head part of the light irradiation apparatus which concerns on the 2nd embodiment of this invention. It is sectional drawing which shows the head part of the light irradiation apparatus which concerns on the 3rd embodiment of this invention. It is explanatory drawing which shows the structure of the head part of the light irradiation apparatus of the conventional comparative example. It is explanatory drawing which shows the structure of the head part of the light irradiation apparatus of the conventional comparative example. It is a figure which shows how to obtain | require the volume of a rotary body.

Below, the embodiment of the light irradiation apparatus which concerns on this invention is described in detail using drawing.
In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. In addition, the dimensional ratios in the drawings do not necessarily match those described with numerical values in this specification.

FIG. 1 is a block diagram of a light irradiation apparatus according to a first embodiment of the present invention.
The light irradiation apparatus 1 shown in this figure is composed of a head unit 2 and a control unit 3, and the head unit 2 and the control unit 3 are connected by a cable 4.

The head unit 2 includes a light emitting diode 11 as a light emitting element that emits ultraviolet light having a wavelength of 365 nm for curing the photocurable resin.
The cable 4 and the control unit 3 are connected to each other by connectors 7a and 7b that are fitted to each other. The irradiation apparatus 1 has a structure in which the cable 4 can be attached and detached as necessary, and can be used by switching to the cable 4 having different types of head portions.

  The control unit 3 includes a power supply unit 5 and a control unit 6 for supplying power to the light emitting diode 11 built in the head unit 2. The control unit 6 has an interface function for setting the intensity of ultraviolet light output from the head unit 2 and the lighting time of the light emitting diode 11, and a memory function for storing the set information.

FIG. 2 is a cross-sectional view for explaining the internal structure of the head unit 2.
The head unit 2 includes a LED unit 21 serving as a housing that houses the above-described light emitting diode 11 that emits ultraviolet light, and a lens unit that includes an emission lens 16a for condensing the ultraviolet light emitted from the light emitting diode 11 at a predetermined position. 22.

  The LED unit 21 includes a light-emitting diode 11, a cylindrical holder 12 that accommodates the light-emitting diode 11, and a base substrate 15. The light-emitting diode 11 is mounted on the base substrate 15 by a fixing ring 17. It is fixed inside the holder 12.

  The light emitting diode 11 is a reflective light emitting diode, and includes an LED chip 111 that emits ultraviolet light, a casing 112, and a pair of lead frames 113 and 114.

  In addition, power is supplied to the light emitting diode 11 by connecting the cable 4 inserted through the through passage 121 provided in the holder 12 to the base substrate 15.

The casing 112 is made of polycarbonate, and its outer shape is a substantially flat rectangular column. A concave portion made of a paraboloid is provided on one surface of the casing 112, and a reflective surface 112a made of an aluminum thin film is formed in the concave portion. Acts as a concave mirror. The concave portion is formed by integral molding or cutting so as to reduce the surface roughness.
In this embodiment, the thin film formed on the reflecting surface 112a can be made of other metal such as silver, dielectric multilayer film, or the like in addition to aluminum.

The LED chip 111 is bonded to one lead frame 114 and is connected to the other lead frame 113 by a wire 115, and the light emitting surface 111 a is fixed in a direction facing the reflecting surface 112 a of the casing 112. Yes.
In addition, the LED chip 111 has the light emitting surface 111a disposed at the focal position of the reflecting surface 112a.
Here, the focal position is a position where the light emitted from the light emitting surface 111a is reflected by the reflecting surface 112a and then becomes substantially parallel light, and includes the vicinity thereof.

  On the other hand, the lens unit 22 includes a lens holder 14 having the same outer diameter as the holder 12, an exit lens 16 a, and a fixing ring 18.

  In the lens unit 22, the exit lens 16 a is attached to the lens holder 14 by a fixing ring 18, and the lens unit 22 is screwed to a screw portion provided at the outer peripheral tip of the holder 12 of the LED unit 21.

  By configuring the head unit 2 in this way, the light emitted from the light emitting surface 111a of the LED chip 111 is reflected by the reflecting surface 112a so as to be substantially parallel to the central axis X of the head unit 2, and is reflected by the output lens 16a. Incident. The light incident on the exit lens 16a is refracted in the direction of the axis X on the exit surface of the exit lens 16a, and is collected near the predetermined position W1.

  In the light irradiation device 1 according to this embodiment, since the light emitting surface 111a of the LED chip 111 is disposed so as to face the reflecting surface 112a, almost all the light beams emitted from the light emitting surface 111a of the LED chip 111 It reaches 112a and is reflected. However, a part of the reflected light beam is blocked by the pair of lead frames 113 and 114 described above. For this reason, it is preferable that the pair of lead frames 113 and 114 be formed as thin as possible.

Here, when the opening side diameter of the reflecting surface 112a of the casing 112 is 7 mm, the area S _m of the opening of the reflecting surface 112a is
It is.
Further, since the pair of 0.7 mm square lead frames 113 and 114 are arranged in the opening of the reflecting surface 112a so as to be orthogonal to the axis X, the cross-sectional area S _{L of the} light blocked by this is expressed as follows.
It becomes.

From the above calculation results, in FIG. 2, the ratio R1 of light that can be incident on the exit lens 16a is
This is about 87% of the total luminous flux reflected by the reflecting surface 112a.

  On the other hand, with respect to the light irradiation device having the configuration shown in FIG. 8A, a method for obtaining the ratio of the light beam incident on the first lens 82 out of the light beam emitted from the light emitting surface 811a of the LED chip 811 is as follows. It becomes as follows.

First, assuming that the light emitting surface 811a of the LED chip 811 is a substantially uniform diffusing surface, the intensity P of light emitted from the light emitting surface 811a is a cosine of an angle θ formed by the direction of the emitted light and the axis X. Proportional. Therefore, if the intensity on the X axis is 1,
The directivity characteristic indicated by a curve drawn with a solid line in the graph of FIG. 3 is obtained.

  Here, it is assumed that the first lens 82 shown in FIG. 8A is a lens having high condensing capability, and an F-number 1 lens having an effective diameter D and a focal length F substantially equal to each other is used. FIG. 9 shows the relationship between the LED chip 811 and the first lens 82 in this case.

  In FIG. 9, the LED chip 811 is disposed at a position corresponding to the focal length F of the first lens 82, and light emitted from the first lens 82 becomes substantially parallel light.

In such a configuration, assuming that the effective diameter D and the focal length F of the first lens 82 are equal, the maximum value of the inclination angle of the light incident on the first lens 82 out of the light flux emitted from the LED chip 811. θ _m is
It becomes. Of the light beams emitted from the light emitting surface 811a of the LED chip 811, the maximum inclination angle θ _{m with} respect to the axis X of the light beam incident on the first lens 82 is about 0.15π (about 26.5 degrees).
Incidentally, the light flux is included in the scope of the maximum inclination angle theta _m, as represented on the graph of FIG. 3, the shown by the shaded region.

  Next, a method for comparing the amount of light flux emitted in the hatched range in FIG. 3 with the amount of all light flux emitted from the light emitting surface of the LED chip will be described.

Here, as shown in FIG. 10, the amount of the light beam included in the range of the maximum inclination angle θ _m is obtained as the volume of the rotating body rotated about the inclination angle of 0 ° as the central axis in FIG. be able to.

Assuming that the volume of the rotating body is V, the volume V is expressed as the sum of the cylindrical solid volume V1 shown in FIG. 10 and the cap-shaped rotating body volume V2 as shown in Expression 6. be able to.

The cylindrical solid volume V1 can be obtained by the product of the bottom area and the height, where the inclination angle θ is the bottom radius and the light intensity P is the cylindrical height.
Can be expressed as

In addition, the volume V2 of the cap-shaped rotating body is obtained by integrating πθ ² in the range from the light intensity Pm to the light intensity of 1, so
Can be expressed as

Here, if P = cos θ from Equation 4,
Because
It can be expressed as. Expand Equation 10 and
Can be requested.

The volume V of the rotating body is obtained by adding V1 obtained by Equation 7 to V2 obtained by Equation 11 above.
Can be expressed as

Here, in the graph shown in FIG. 3, the volume (light V _L ) of the hatched region is obtained. The volume when rotated with the tilt angle of 0 degree as the central axis is the light _VL that can be incident on the first lens 82, and 0.15π is set as θ in Equation 12 as the tilt angle θ _m obtained in Equation 5. Substituting
It becomes.

On the other hand, the total amount V _T of light emitted from the light emitting surface 811a of the LED chip 811 is the solid line (range from −90 degrees to 90 degrees) of the graph shown in FIG. Can be obtained as the volume when rotated around the center axis. Substituting π / 2 into θ in Equation 12,
Can be requested.

From the above calculation results, when the LED chip 811 and the first lens 82 are configured as shown in FIG. 9, the ratio R2 of light that can be incident on the first lens 82 is
Thus, the total luminous flux emitted from the light emitting surface 811a of the LED chip 811 is about 18%.

  Note that the above calculation is based on the assumption that an F-number 1 lens having the same lens diameter and focal length as the first lens 82 is used. However, even if the F number is further reduced and a lens capable of entering light at an angle of about 30 degrees with respect to the axis X is used, the luminous flux that can be taken into the first lens 82 is the light emitting surface of the LED chip 811. It is a ratio of about 22% with respect to the total luminous flux emitted from 811a.

  As described above, the light irradiation device 1 in this embodiment uses a reflective light emitting diode as a light emitting element accommodated in the head portion. Therefore, as compared with the light emitting diode 81 using the light emitting surface 811a of the LED chip 811 shown in FIG. 8A, the light irradiation device 1 has dramatically improved the utilization efficiency of the ultraviolet light emitted from the LED chip. At the same time, it is possible to increase the light intensity in the region condensed by the exit lens 16a.

  By the way, in the above comparison, the light beam emitted from the LED chip 811 is assumed to be uniform diffused light from the light emitting surface 811a, and is emitted within a range of about 90 degrees with respect to the axis X. However, in general, the luminous flux emitted from the LED chip includes light emitted from the side surface perpendicular to the light emitting surface 811a in addition to the light emitted from the light emitting surface 811a perpendicular to the axis X. For this reason, the directivity characteristic is a characteristic that radiates light at an angle inclined by 90 degrees or more with respect to the axis X as indicated by a broken line in the graph of FIG.

  In the reflection type light emitting diode 11 in the present embodiment, the opening end 112c of the reflection surface 112a of the light emitting diode 11 is arranged on the exit lens 16a side (in the drawing, with respect to the focal position of the reflection surface 112a on which the LED chip 111 is installed). On the right). Therefore, it is possible to effectively use a light beam inclined by 90 degrees or more from the central axis emitted from the LED chip 111 described above.

  Further, the light emitting diode 81 shown in FIG. 8A condenses the first lens 82 for converting the light beam radiated from the LED chip 811 into a substantially parallel light beam and a spot shape in the irradiated region W. Therefore, the second lens 83 is required. On the other hand, in the light irradiation device 1 in this embodiment, since the radiated light beam from the light emitting diode 11 is emitted as substantially parallel light, a lens corresponding to the first lens 82 in FIG. be able to.

  Thus, according to the light irradiation device 1 in the present embodiment, a large-diameter lens is not required as an optical system for condensing the ultraviolet rays emitted from the light emitting diodes 11 in the irradiated region W, and The head portion can be configured without using a plurality of lens groups. For this reason, the light irradiation apparatus which can irradiate the irradiated object efficiently with the light radiated | emitted from LED chip, without enlarging the external shape of a head part can be provided.

In addition, as described above, it is possible to reduce the power supplied to the light emitting diode by improving the utilization efficiency of the light emitted from the LED chip. Furthermore, heat generation from the light emitting diode can be suppressed, and the life of the light emitting diode can be greatly extended.
In the light irradiation device 1 of this embodiment, the light emitting diode 11 is a reflective light emitting diode in which the LED chip 111 and the concave mirror formed by the reflecting surface 112a are integrally formed. Further, a light transmissive material may be filled between the LED chip 111 and the reflection surface 112a. Furthermore, the same effect as that of the present embodiment can be obtained by separating these light emitting diodes and mounting the LED mirror alone and the concave mirror separately.

  Further, as a modification of the light irradiation apparatus in the present embodiment, a plurality of lens units 22 equipped with lenses having different focal lengths are prepared, and these are appropriately applied to an object to be irradiated that requires different irradiation ranges and irradiation intensities. By exchanging, it can respond appropriately.

  As an example, the head unit 2 shown in FIG. 4 includes an exit lens 16b having a shorter focal length than the exit lens 16a shown in FIG. Light can be irradiated with strong ultraviolet intensity.

  If the irradiated area is a relatively wide range, a cover glass 13 made of glass, plastic or quartz is used for the lens unit 22 as shown in FIG. 5 instead of the exit lens 16b shown in FIG. It is possible to configure the head portion. In this case, since the light beam emitted from the cover glass 13 reaches the irradiated object with a slight spread while being substantially parallel light, it is suitable for use in applications where the distance to the irradiated object varies.

  The cover glass 13 is used for the purpose of preventing contamination of the light-emitting diode 11 with a solvent that evaporates when the photocurable resin is cured when the light irradiation device 1 in this embodiment is used for curing the photocurable resin with ultraviolet rays. It is done. On the other hand, when there is no possibility of such solvent evaporation, the lens unit 22 itself including the cover glass 13 can be omitted.

FIG. 6 shows a cross-sectional view of the light irradiation apparatus according to the second embodiment of the present invention.
The head portion 2 shown in FIG. 6 is shown in FIG. 5 except that the shape of the reflective surface 112b formed in the recess of the casing 112 of the light emitting diode 11 is different from the shape of the reflective surface 112a shown in FIG. The configuration is the same as that of the head unit 2.

  In FIG. 6, the reflection surface 112 b has a spheroid shape whose one focal point is the position where the LED chip 111 is disposed. The light radiated from the light emitting surface 111a of the LED chip 111 is reflected by the reflecting surface 112b, passes through the cover glass 13, and is then condensed near the other focal position W3 of the reflecting surface 112b.

  In the light irradiation device according to the present embodiment, since the shape of the reflecting surface 112b is a spheroid, the light emitted from the light emitting surface 111a of the LED chip 111 is collected on the irradiated object without using an exit lens. Therefore, the head portion can be reduced in size.

  The cover glass 13 attached to the lens unit 22 is used for the purpose of preventing the light-emitting diode 11 from being contaminated by a solvent that evaporates when the photocurable resin is cured, as in the case of the light irradiation device shown in FIG. .

FIG. 7 shows a cross-sectional view of a light irradiation apparatus according to the third embodiment of the present invention.
The head unit 2 shown in FIG. 7 is characterized in that two light emitting diodes 11 having a reflecting surface are arranged on the same plane of the base substrate 15a.
Each of the two reflective light emitting diodes 11 includes a reflecting surface 112a having a rotating plane shape, and the LED chip 111 is disposed at the focal position of each reflecting surface 112a.

  Since each of the LED chips 111 is arranged with the light emitting surface 111a facing the respective reflecting surfaces 112a, the luminous flux emitted from the light emitting surface 111a is separated from the central axis X of the head unit 2 by the corresponding reflecting surface 112a. The light is reflected so as to be substantially parallel and enters the exit lens 16c. The light that has entered the exit lens 16c is refracted in the direction of the axis X on the exit surface of the exit lens 16c, and is collected in the vicinity of the predetermined position W4.

  In the light irradiation device of this embodiment, two light emitting diodes 11 each having a reflecting surface 112a having a rotating body surface shape are arranged on the same plane of the base substrate 15a. Therefore, the light beams emitted from the respective light emitting diodes 11 are substantially parallel to each other, and can be condensed on the irradiated region W4 by the same exit lens 16c.

  As a result, the light irradiation apparatus of this embodiment does not need to use a plurality of lenses for converting the light beams emitted from the two light emitting diodes 11 into substantially parallel light beams, in addition to the emission lens 16c. The intensity of the light condensed on the irradiated region W4 can be increased without increasing the outer shape of the.

  Moreover, in the head part 2 shown in FIG. 7, although the two light emitting diodes 11 are drawn, there is no restriction | limiting in the number of the light emitting diodes to be used, and it can adjust as needed.

  Furthermore, as a modification of the light irradiation device in this embodiment, light emitting diodes having different emission wavelengths can be accommodated in the head unit 2.

  In general, a photocurable resin that is cured by ultraviolet irradiation is designed to be cured by irradiation of ultraviolet light having a wavelength of about 365 nm. However, near the surface of the resin that comes into contact with air, oxygen molecules are combined with resin molecules to form a resin. Phenomenon that inhibits the curing reaction. For this reason, one light emitting diode 11 irradiates ultraviolet rays having a wavelength of about 255 nm for separating oxygen molecules and resin molecules. The other light emitting diode 11 emits ultraviolet light having a wavelength of around 365 nm. By condensing ultraviolet rays having a wavelength of about 255 nm and ultraviolet rays having a wavelength of around 365 nm in the irradiated region W4, the surface and the inside of the resin can be uniformly cured.

  In the light irradiation apparatus of this modification, in the head unit 2 shown in FIG. 7, the two light emitting diodes 11 and 11 arranged on the same plane of the base substrate 15a have one emission wavelength of 365 nm and the other of 255 nm. By arranging them close to each other, it is possible to mix and irradiate light having a wavelength of 365 nm and a wavelength of 255 nm to the irradiated region W4 without increasing the outer shape of the head unit 2. The focal position changes slightly due to the difference in wavelength, but in this case, it can be dealt with by changing the curvature of one reflecting surface 112a according to the wavelength.

  The light irradiating device of the present invention can be suitably used when irradiating a photocurable resin with ultraviolet rays or visible light having a wavelength of 400 nm in an assembling operation of an optical pickup or an electronic component. In particular, when a plurality of head portions are arranged in a limited range, the emitted light from the light emitting element can be efficiently condensed without increasing the size of the head portion.

DESCRIPTION OF SYMBOLS 1 Light irradiation apparatus 2 Head part 3 Control part 4 Cable 5 Power supply part 6 Control part 11 Light emitting diode 12, 12a Holder 13 Cover glass 14, 14a Lens holder 15, 15a Base board | substrate 16a, 16b, 16c Outgoing lenses 17, 18 Fixing ring 21 LED unit 22 Lens unit 111 LED chip 111a Light emitting surface 112 Casing 112a, 112b Reflecting surface 113, 114 Lead frame 115 Wire

Claims (9)

A light emitting diode with an LED chip that emits light;
A concave mirror having a reflecting surface for reflecting the light;
A housing for housing the LED chip and the concave mirror;
A light irradiation device for irradiating an irradiated object with light emitted from the LED chip,
The light emitting surface of the LED chip is disposed to face the reflecting surface of the concave mirror;
The light irradiation apparatus characterized by this. The light emitting diode is
A reflective light emitting diode in which the LED chip and the concave mirror are integrally formed;
The light irradiation apparatus according to claim 1. The LED chip is
Arranged inside the concave mirror from the opening end of the concave mirror,
The light irradiation apparatus according to claim 1 or 2. The concave mirror includes a rotating paraboloid on its reflecting surface;
The light emitting surface of the LED chip is disposed at the focal position of the rotating paraboloid,
The light irradiation apparatus according to any one of claims 1 to 3. A lens unit including a lens for condensing the light emitted from the LED chip in a spot shape with respect to the irradiated object in the light emitting portion of the housing;
The light irradiation apparatus according to claim 1, wherein The lens unit is detachably attached to the housing;
The light irradiation apparatus according to claim 5. A plurality of the LED chips are arranged on the same plane, and the light emitted from the plurality of LED chips is collected by the same lens unit;
The light irradiation apparatus according to claim 5 or 6. One or more LED chips out of the plurality of LED chips emit light having a central wavelength different from light emitted by other LED chips;
The light irradiation apparatus according to claim 7. The concave mirror includes a spheroid on its reflecting surface,
The light emitting surface of the LED chip is disposed at the focal position of the spheroid,
The light irradiation apparatus according to any one of claims 1 to 3.