AU2018282844B2

AU2018282844B2 - Illumination device

Info

Publication number: AU2018282844B2
Application number: AU2018282844A
Authority: AU
Inventors: Motonao YAGI
Original assignee: CCS Inc
Current assignee: CCS Inc
Priority date: 2017-06-12
Filing date: 2018-06-12
Publication date: 2023-03-23
Anticipated expiration: 2038-06-12
Also published as: WO2018230540A1; EP3640526A4; JP7217702B2; JPWO2018230540A1; EP3640526A1; AU2018282844A1

Abstract

The present invention is an illumination device comprising light sources (20) in which filaments (21) are used, wherein the illumination device (100) comprises: a plurality of light sources (20) with which control of the light-gathering properties and of the uniformity of light irradiated on an object is facilitated and parts that are to be connected, such as sockets (20B), can be protected from heat, the plurality of light sources (20) being aligned in one row or a plurality of rows and being designed to flatten the intensity distribution of light irradiated on the object; and a casing (10) that accommodates the light sources (20) and has a light extraction port X formed therein for extracting light from the light sources. The light sources (20) have: light-emitting parts (20A) in which the filaments (21) are accommodated in tubular accommodating bodies (22); and parts that are to be connected, such as the sockets (20B), to which the light-emitting parts (20A) are connected. The illumination device (100) furthermore comprises shielding members (60) disposed in an orientation in which light emitted from the outer circumferential surfaces (221) of the accommodating bodies (22) can be extracted from the light extraction port X, the shielding members (60) covering at least part of the sockets (20B) and shielding the light emitted from the light-emitting parts (20A) toward the sockets (20B).

Description

SPECIFICATION

Title of Invention

Illumination device

Technical Field

[0001]

The present invention relates to an illumination device.

Background Art

[0002]

An illumination device including a light source using a

filament, such as a halogen lamp, is superior to ones using LED

light sources in emitting light having high intensity over a wide

wavelength range up to an infrared range, and used for, for example,

contamination inspection, appearance inspection, and the like

together with an infrared camera.

[0003]

As this sort of illumination device, as disclosed in Patent

Literature 1, there is one in which multiple halogen lamps each

adapted to contain a filament in a tubular container whose tip is

sealed are arrayed in line. Specifically, this illumination device is

configured to provide an ellipsoidal reflector at the back of each of

the halogen lamps and also provide a reflective plate at the front to

reflect light emitted from the halogen lamp toward an object while

condensing the light.

[0004]

However, in the case of the halogen lamp whose container tip is sealed, the light from the filament is refracted in an unexpected direction at the sealed part, thus making it difficult to control the light condensability of the light emitted from the halogen lamp and the uniformity of light applied to the object.

Citation List

Patent Literature

[0005]

[Patent Literature 1]

Japanese Unexamined Utility Model Application Publication

No. 56-60949

[0006]

Therefore, in the process of developing the present invention,

the present inventor intermediately conceived a configuration in

which tubular containers having sealed tips were arrayed in line in

a state of being laid down and light emitted from the outer

circumferential surfaces of the containers was guided to an object.

[0007]

In such a configuration, light from filaments is emitted from

the outer circumferential surfaces of the containers and guided to

the object without being refracted in an unexpected direction, thus

making it easy to control the light condensability and uniformity of

light applied to the object.

[0008]

Meanwhile, as described above, light sources using the

filaments are configured to connect the containers containing the filaments to sockets and supply current to the filaments via the sockets, and therefore light over a wide wavelength range including infrared wavelengths produced by the light emission of the filaments is applied to the sockets.

As a result, there occur the problems that the sockets are

damaged by heat and light having a specific wavelength among the

light from the filaments is absorbed by the sockets to cause

unevenness in the intensity distribution of the light applied to the

object. Such problems are problems also occurring even when

connecting the containers to connected parts such as electric cables

and relay boards without the sockets.

Summary

[0008a]

It is an object of the present invention to substantially

overcome or at least ameliorate one or more of the above

disadvantages.

[0009]

Aspects of the present disclosure provide an illumination

device including light sources using filaments, make it easy to

control the light condensability and uniformity of light applied to

an object, as well as make it possible to protect connected parts

such as sockets from heat, and more flatten the intensity

distribution of the light applied to the object.

[0009a]

An aspect of the present invention provides an illumination device comprising: multiple light sources arrayed in one line or multiple lines; and a casing that contains the light sources and is formed with a light extraction opening for extracting light from the light sources, wherein the light sources include light emitting parts adapted to contain filaments in tubular containers and connected parts connected with the light emitting parts, and are arranged in a posture in which light emitted from outer circumferential surfaces ofthe containers is extracted through the light extraction opening, the illumination device further comprising a shielding member that covers at least parts of the connected parts and shields light traveling toward the connected parts after emission from the light emitting parts, the multiple light sources arrayed in one line or multiple lines are arranged in a posture in which the outer circumferential surfaces ofthe containers are opposite the light extraction opening, the filaments are wound conductive wires; the multiple light sources are arranged so that the filaments of the respective light sources extend along and line up along an array direction of the light sources; and the light emitting parts, the connected parts, and the shielding member are housed within the casing

[0010]

That is, the illumination device according to the present invention is an illumination device including: multiple light sources arrayed in one line or multiple lines; and a casing that contains the light sources and is formed with a light extraction opening for extracting light from the light sources, in which the

4a light sources include light emitting parts adapted to contain filaments in tubular containers and connected parts connected with the light emitting parts, and are arranged in a posture in which light emitted from the outer circumferential surfaces of the containers is extracted through the light extraction opening, and the illumination device further includes a shielding member that covers at least parts of the connected parts and shields light traveling toward the connected parts after emission from the light emitting parts. Note that the term "light traveling toward the connected parts" here includes not only light traveling toward the connected parts directly from the light emitting parts but also light traveling toward the connected part after reflection by surrounding members.

[0011]

In the illumination device configured as described, since the

light sources are arranged in the posture in which the light emitted

from the outer circumferential surfaces of the containers is

extracted through the light extraction opening, even when the tips

of the containers are sealed, light from the filaments is emitted

from the outer circumferential surfaces of the containers and

guided to an object without being refracted in unexpected

directions. This makes it easy to control the light condensability

and uniformity of light applied to the object.

In addition, since the shielding member covers at least parts

of the connected parts and shields the light traveling toward the connected parts from the light emitting parts, the connected parts can be protected from heat, and light having a specific wavelength is not absorbed by the connected parts, making it possible to flatten the intensity distribution of the light applied to the object.

[0012]

It is preferable that in a state where electric cables for

supplying current to the filaments are connected to the connected

parts, the shielding member covers at least parts of the electric

cables and shields light traveling toward the electric cables after

the emission from the light emitting parts. Note that the term

"light traveling toward the electric cables" here includes not only

light traveling toward the electric cables directly from the light

emitting parts but also light traveling toward the electric cables

after reflection by surrounding members.

In such a configuration, the electric cables can be protected

from heat.

[0013]

It is preferable that the shielding member is an elongated

one extending along an array direction of the light sources, and

covers the connected parts of the respective light sources included

in the one line. In such a configuration, as compared with a

configuration that, for example, provides shielding members to the

respective light sources, the number of parts can be reduced,

facilitating device assembly.

[0014]

It is preferable that the shielding member is fixed to the

casing, and the connected parts are attached to the shielding

member.

In such a configuration, the need to separately provide

members for fixing the connected parts can be eliminated to

simplify a device configuration.

[0015]

It is preferable that the shielding member forms a

containing space that contains the connected parts and with

respect to which air can flow in/out.

In such a configuration, air inside the casing and air outside

the casing flow into the containing space, and therefore the air can

cool the connected parts to surely protect the connected parts from

heat.

[0016]

It is preferable that the multiple light sources arrayed in one

line or multiple lines are arranged in a posture in which the outer

circumferential surfaces of the containers are opposite to the light

extraction opening.

In such a configuration, even if the light from the filaments

is refracted in unexpected directions at sealed parts of the

containers, the light extracted through the light extraction opening

is hardly affected by this, and the light condensability and

uniformity of the light extracted through the light extraction

opening can be further improved.

[0017]

Specific embodiments include a configuration in which the

multiple light sources arrayed in one line or multiple lines are

arranged in a posture in which an array direction and axial

directions of the containers are orthogonal to each other.

[0018]

More specifically, it is preferable that the multiple light

sources arrayed in one line or multiple lines are arranged in a

posture in which the tips of the containers face in mutually the

same direction.

In such arrangement, the shielding member and the electric

cables can be put together on one side, making it possible to

simplify the overall configuration and facilitate wiring.

[0019]

On the other hand, as described above, when the light

sources are arranged in the posture in which the tips of the

containers face in mutually the same direction, narrowing the

interval between mutually adjacent light sources may cause the

interference between the sockets of the light sources, and therefore

it is necessary to keep the distance between the light sources to the

extent that the sockets do not interfere. As a result, the

unevenness of illumination intensity in the longer direction of

linear light occurs.

For this reason, it is preferable that the multiple light

sources arrayed in one line or multiple lines are arranged in a posture in which the tips of containers of mutually adjacent light sources along an array direction face in mutually opposite directions.

In such arrangement, between mutually adjacent light

sources arrayed facing in some direction, each of light sources

arrayed facing in the opposite direction to that direction can be

arranged, and therefore the arrangement interval between light

sources can be narrowed, making it possible to reduce the

unevenness of illumination intensity in the longer direction of

linear light.

[0020]

It is preferable that the light sources are ones that emit light

including an infrared wavelength, and the shielding member is

formed of material that reflects light having an infrared

wavelength.

In such a configuration, the output power of the infrared

light extracted through the light extraction opening can be

improved.

[0021]

According to the present invention configured as described,

in the illumination device including the light sources using

8a filaments, it is achieved to make it easy to control the light condensability and uniformity of light applied to an object, as well as reduce heat damage to the connected parts such as the sockets, and make it possible to more flatten the intensity distribution of the light applied to the object.

Brief Description of Drawings

[0022]

[Fig. 1]

Fig. 1 a perspective view illustrating the configuration of an

illumination device in the present embodiment.

[Fig. 2]

Fig. 2 is a perspective view illustrating the internal

configuration of a casing of the illumination device in the present

embodiment.

[Fig. 3]

Fig. 3 is a plan view illustrating the configuration and

arrangement of light sources in the present embodiment.

[Fig. 4]

Fig. 4 is a cross-sectional view illustrating the internal

configuration of the casing of the illumination device in the present

embodiment.

[Fig. 5]

Fig. 5 is a perspective view illustrating the internal

configuration of the casing of the illumination device in the present

embodiment.

[Fig. 6]

Fig. 6 is a plan view illustrating the configuration of a light

source in another embodiment.

[Fig. 7]

Fig. 7 is a plan view illustrating the configuration of light

sources in another embodiment.

[Fig. 8]

Fig. 8 is a cross-sectional view illustrating the internal

configuration of a casing of an illumination device in one other

embodiment.

[Fig. 9]

Fig. 9 is a perspective view illustrating the surrounding

configuration of light sources in the one other embodiment.

Description of Embodiments

[0023]

In the following, one embodiment of the illumination device

according to the present invention will be described with reference

to drawings.

[0024]

An illumination device 100 according to the present

embodiment is one used to, for example, perform contamination

inspection, appearance inspection, or the like using an infrared

camera, and a surface light emitting device that applies light

having infrared wavelengths (hereinafter referred to as infrared

light) to an inspection object.

In addition, as the infrared camera, for example, a

hyperspectral camera that includes a spectroscope to be able to

acquire information over a wide wavelength range is preferable,

but other various types of ones can be used.

[0025]

Specifically, as illustrated in Fig. 1 and Fig. 2, the

illumination device 100 includes: a casing 10 formed with a light

extraction opening X; and multiple light sources 20 contained in the

casing 10. In addition, Fig. 2 illustrates the internal

configuration of the casing 10, but omits the illustration of the

below-described electric cables EL.

[0026]

The casing 10 is one that is formed in, for example, a

substantially rectangular parallelepiped shape and whose one

surface (upper plate 11) is formed with the light extraction opening

X, and here the light extraction opening X is provided with a

diffuser plate 30 having transparency. In addition, instead of the

diffuser plate 30, the light extraction opening X may be provided

with a light transmissive window allowing light to transmit

without diffusing the light.

Also, the back surface (outer surface) of a bottom plate 12 on

the opposite side to the light extraction opening X is provided with

a heat radiating member 40 such as heat radiating fins for

radiating heat from the light sources 20, and the front surface

(inner surface) of the bottom plate 12 is provided with a reflective plate 50 that reflects infrared light. Further, in the present embodiment, at least part of the inner surfaces of side plates 13 of the casing 10 is provided with a reflective plate 50. In addition, a reflective plate 50 is not necessarily provided on the bottom plate

12 or the side plate 13.

[0027]

As illustrated in Fig. 2, the light sources 20 are arranged in

lines in the casing 10, and specifically, as illustrated in Fig. 3, are

so-called halogen lamps each having: a light emitting part 20A

adapted to contain a filament 21 in a tubular container 22 whose

tip is sealed; and a socket 20B as a connected part connected with

the light emitting part 20A.

[0028]

Describing more specifically, the filament 21 is a conductive

wire which has been wound and emits light while generating Joule

heat when supplied with current. The filament 21 here extends in

a direction perpendicular to an axial direction of the container 22,

and from both ends thereof, lead-in wires 23 extend. The lead-in

wires 23 are respectively connected to terminals 24 led out of the

container 22, and by inserting the respective terminals 24 into the

socket 20B, the light emitting part 20A and the socket 20B are

connected.

[0029]

The container 22 is one that is called a bulb made of glass

and formed in a cylindrical and tapered shape, and the fore end thereof is provided with a tip 25 formed when a fore end opening was sealed by glass fusion or the like. Also, a back end opening is sealed by a flat sealing member 26.

[0030]

The socket 20B is a blockish one formed with unillustrated

insertion ports connected with the terminals 24, and here

configured to be inserted with the light emitting part 20A along the

axial direction of the container 22. Specifically, as viewed in the

axial direction of the container 22, the socket 20B is formed in a

cylindrical shape whose diameter is, for example, larger than the

container 22 so that the socket 20B protrudes outward of the

container 22, and a mounting surface 27 opposite to the light

emitting part 20A is formed with the insertion ports. The socket

20B is connected with the electric cables EL for supplying current

to the filament 21, and as illustrated in Fig. 1, the electric cables

EL are led out of the casing through a through-hole 1h formed in a

side plate 13 of the casing 10 in a state where, for example,

multiple cables are bundled, and connected to an unillustrated

power supply.

[0031]

As illustrated in Fig. 2, the above-described light sources 20

are arrayed in mutually parallel multiple lines, and multiple light

sources 20 arrayed in each of the lines are arranged in a posture in

which the outer circumferential surfaces 221 of their containers 22

are opposite to the light extraction opening X. Describing in more detail, the respective light sources 20 are arranged in a posture in which the axial directions of the container 22 and a plane direction of the light extraction opening X (a direction perpendicular to the normal direction of the light extraction window X) are parallel.

In addition, the axial directions of the container 22 are not

necessarily required to be parallel to the plane direction of the light

extraction opening X, but may be tilted with respect to the light

extraction opening X.

[0032]

In the present embodiment, the respective light sources 20

arrayed in lines are arranged in a posture in which an array

direction and the axial directions of the containers 22 are

orthogonal, i.e., arranged so that the filaments 21 of the respective

light sources 20 extend along the array direction, and the axial

directions of the respective containers 22 are mutually parallel.

Also, the respective light sources 20 arrayed in lines are arranged

in a posture in which the tips of the containers 22 face in mutually

the same direction, i.e., in a posture in which the tips and back

ends of the respective containers 22 are respectively positioned in

straight lines along the array direction.

In addition, the filaments 21 are not necessarily required to

extend along the array direction but may extend in a direction

tilted with respect to the array direction. Also, the axial

directions of the respective containers 22 are not necessarily

required to be all mutually parallel.

[0033]

In addition, as illustrated in Fig. 4, the illumination device

100 of the present embodiment is adapted to further include

shielding members 60 that cover at least parts of the sockets 20B

and shield light traveling toward the sockets 20B after emission

from the light emitting parts 20A.

[0034]

The shielding members 60 are made of material that reflects

infrared light without transmitting it. In addition, the reflection

includes specular reflection and diffuse reflection.

[0035]

As illustrated in Fig. 2 and Fig. 4, the shielding members 60

of the present embodiment are ones whose at least parts interpose

between the mounting surfaces 27 of the sockets 20B and the

containers 22 to cover the mounting surfaces 27, and formed in an

elongated shape extending along the array direction of the light

sources 20. The shielding members 20 are provided for the

respective lines of the light sources 20 arranged in lines, and each

of the shielding members 60 is configured to cover sockets 20B of all

light sources 20 included in a corresponding line.

[0036]

The shielding members 60 are ones that form containing

spaces S containing the sockets 20B and whose cross sections are

formed in a rectangular shape opening downward. Specifically, as

illustrated in Fig. 4, each of the shielding members 60 has: a front wall 61 that covers mounting surfaces 27 of corresponding sockets

20B; a back wall 62 that is opposite to the front wall 61 and

provided at the back of the sockets 20B; and an upper wall 63 that

interposes between the front wall 61 and the back wall 62 and is

provided above the sockets 20B. In addition, the front wall 61,

back wall 62, and upper wall 63 may be integrally formed or

separate members; however, here, the front wall 61 and the upper

wall 63 are integrally formed, and the back wall 62 is configured as

a separate body from them. Also, the shielding member 60 is not

necessarily required to have the front wall 61, the back wall 62, or

the upper wall 63, but as long as it has at least the front wall 61,

may be one not having, for example, the upper wall 63 as with a

shielding member 60 illustrated in the last line in Fig. 2 and Fig. 4

or one not having the upper wall 63 and the back wall 62 although

not illustrated.

[0037]

The front wall 61 is a flat plate-like one formed with

through-holes 6h inserted with corresponding light emitting parts

20A, and here the multiple through-holes 6h are formed along the

longer direction, for example, at regular intervals. These

through-holes 6h are formed at positions respectively

corresponding to the light emitting parts 20A of the respective light

sources 20 arrayed in line, and by inserting the light sources 20

into the respective through-holes 6h from the tips thereof, the front

wall 61 is arranged in a state of being opposite to the mounting surfaces 27 of the sockets 20B.

In the present embodiment, as described above, since the

upper wall 63 and the front wall 61 are integrally provided, by

arranging the front wall 61 close to the mounting surfaces 27 of the

sockets 20B, the upper wall 63 is arranged above the sockets 20B.

[0038]

The back wall 62 is a flat plate-like one provided in parallel

with the front wall 61, and the lower end part thereof is formed

with a flange part that is bent along the bottom surface of the

casing 10. In addition, by attaching the flange part on the bottom

surface of the casing 10 using screws or the like, the shielding

member 60 is fixed to the casing 10.

In the present embodiment, a surface of the back wall 62

opposite to the front wall 61 is attached with the sockets 20B via

screws or the like, and the shielding member 60 is also used for

fixing the sockets 20B and for positioning the sockets 20B.

[0039]

A space surrounded by the above-described front wall 61,

back wall 62, and upper wall 63 is a containing space S, and the

containing space S here is configured to enable air to flow in/out

without being sealed. Specifically, as illustrated in Fig. 2, one end

or both ends of the shielding member 60 in its longer direction is

opened without being blocked, and air inside the casing 10 is

configured to flow in/out with respect to the containing space S

through the one end opening or both end openings.

[0040]

In the present embodiment, one ends of the shielding

members 60 in their longer direction are opened, and the other ends

are partially blocked by the above-described reflective plate 50. In

addition, as illustrated in Fig. 5, the reflective plate 50 is formed

with through-holes 5h for passing the electric cables EL, and the

electric cables EL wired along between the reflective plate 50 and

the inner surface of the casing 10 are configured to be insertable

into the containing spaces S through the through-holes 5h. That

is, the containing spaces S in the present embodiment contain at

least parts of the electric cables EL, and the shielding members 60

are configured to cover at least parts of the electric cables EL and

shield light traveling toward the electric cables EL after emission

from the light emitting parts 20A.

[0041]

According to the illumination device 100 of the present

embodiment configured as described, the light sources 20 are

arranged in a posture in which the light emitted from the outer

circumferential surfaces 221 of the containers 22 are extracted

through the light extraction opening X, and therefore the light from

the filaments 21 is emitted from the outer circumferential surfaces

221 of the containers 22 and guided to the object without being

refracted in unexpected directions. This makes it easy to control

the light condensability and uniformity of light applied to the

object.

In addition, since the shielding members 60 cover the

sockets 20B to shield the light emitted from the light emitting parts

20A, the sockets 20B can be protected from heat, and light having a

specific wavelength is not absorbed by the sockets 20B, making it

possible to flatten the intensity distribution of the light applied to

the object.

[0042]

Also, since the shielding members 60 cover the electric

cables EL to shield the light emitted from the light emitting parts

20A, the electric cables EL can be protected from heat.

[0043]

Further, since the shielding members 60 are elongated ones

extending along the array direction of the light sources 20 and the

shielding members 60 are provided corresponding to the respective

lines, as compared with a configuration that provides shielding

members 60 to the respective light sources 20, the number of parts

is small and device assembly is easy.

[0044]

In addition, since the shielding members 60 are fixed to the

casing 10 and the sockets 20B are attached to the shielding

members 60, the need to separately provide members for fixing and

positioning the sockets 20B can be eliminated to simplify a device

configuration.

[0045]

In further addition, since the containing spaces S are configured so that air can flow in/out, air inside the casing 10 and air outside the casing 10 flow into the containing spaces S. This makes it possible to cool the sockets 20B, and the sockets 20B can be surely protected from heat.

[0046]

In addition, since the multiple light sources 20 arrayed in

lines are arranged in the posture in which the outer circumferential

surfaces 221 of the container 22 are opposite to the light extraction

opening X, even if the light from the filaments 21 are refracted in

unexpected directions at the sealed parts of the containers 22, the

light extracted through the light extraction opening X are hardly

affected by this, making it possible to further improve the light

condensability and uniformity of the light extracted through the

light extraction opening X.

[0047]

Also, since the multiple light sources 20 arrayed in lines are

arranged in the posture in which the tips of the containers 22 face

in mutually the same direction, the shielding members 60 and the

electric cables EL can be put together on one sides ofthe containers

22 in their axial directions, making it possible to simplify the

overall configuration and facilitate wiring.

[0048]

Further, since the shielding members 60 are formed of

material that reflects light having infrared wavelengths, the

output power of the infrared light extracted through the light extraction opening X can be improved.

[0049]

Note that the present invention is not limited to the

above-described embodiment.

[0050]

For example, the illumination device is described in the

above-described embodiment as a surface light emitting device in

which the light sources are arrayed in multiple lines, but may be

configured as a linear light illumination device in which light

sources are arrayed in one line.

[0051]

Also, in the above-described embodiment, the shielding

members are elongated ones, and each of them is configured to

cover sockets of all light sources included in one line; however, the

shape and arrangement of the shielding members may be

appropriately changed, such as providing one shielding member to

one light source.

[0052]

Further, the shielding members in the above-described

embodiment are ones whose cross sections are of a rectangular

shape opening downward; however, the cross sectional shape may

be appropriately changed, such as a semicircular shape, elliptical

shape, or triangular shape opening downward.

Also, the shielding members in the above-described

embodiment are arranged so as to shield light traveling toward the sockets directly after emission from the light sources, but may be arranged so as to shield light traveling toward the sockets after reflection by surrounding members such as the diffuser plate provided to the light extraction opening.

[0053]

In the above-described embodiment, the sockets are attached

to the shielding members; however, for example, the sockets may be

attached to the bottom surface of the casing or attached to members

different from the shielding members.

[0054]

Also, the sockets 20B in the above-described embodiment are

configured to be inserted with the light emitting parts 20A along

the axial directions of the containers 22; however, the insertion

directions of the light emitting parts 20A do not have to be along

the axial directions, but may be changed to have various

configurations.

[0055]

Further, the light sources in the above-described

embodiment are described as ones whose filaments extend in

directions perpendicular to the axial directions of the containers;

however, as illustrated in Fig. 6, the filaments 21 may be ones

extending along the axial directions of the containers 22.

[0056]

Also, in the above-described embodiment, the respective

light sources arrayed in lines are arranged in the posture in which the tips of the containers face in mutually the same direction; however, as illustrated in Fig. 7, the arrangement may be made in a posture in which the tips of containers 22 of mutually adjacent light sources 20 along the array direction face in mutually opposite directions.

In such a configuration, between mutually adjacent light

sources 20 arrayed facing in some direction, each of light sources 20

arrayed in the opposite direction to that direction can be arranged,

and therefore the arrangement interval between mutually adjacent

light sources 20 can be narrowed without interference between

corresponding sockets 20B, making it possible to reduce the

unevenness of illumination intensity in the longer direction of

linear light.

[0057]

Also, as the illumination device 100 according to the present

invention, as illustrated in Fig. 8 and Fig. 9, a reflective plate 50 as

a reflective member provided opposite to the light extraction

opening X may be provided integrally with a shielding member 60.

[0058]

Describing more specifically, as in the above-described

embodiment, the shielding member 60 includes a front wall 61,

back wall 62, and upper wall 63, and here the back wall 62 is

provided integrally with the reflective plate 50. In addition, the

front wall 61 may be provided integrally with the reflective plate

50.

[0059]

Further, the reflective plate 50 and the shielding member 60

are further integrated with the light sources 20. Specifically,

sockets 20B constituting corresponding ones of the light sources 20

are connected to the shielding member 60 by screws or the like. In

doing so, the light sources 20, the reflective plate 50, and the

shielding member 60 constitute a unit structure Z in which they are

unitized. Here, the multiple light sources 20 arrayed along a

direction orthogonal to the light axes of the light sources 20, and

the reflective plate 50 and shielding member 60 provided

corresponding to the multiple light sources 20 constitute the unit

structure Z.

[0060]

As illustrated in Fig. 9, the unit structure Z is supported by

support members 70. The support members 70 are ones that

support the unit structure Z separately from a surface (bottom

plate 12) opposite to the light extraction opening X of a casing

toward the light extraction opening X side. The support members

70 here support the light sources 20, but may support the reflective

plate 50 or the shielding member 60. Also, Fig. 9 illustrates the

two support members 70; however, the number of the support

members 70 is not limited to this, but may be one or three or more.

By arranging the unit structure Z separately from the

bottom plate 12 as described, a second containing space S2 that

contains, for example, a circuit board C, unillustrated electric cables, and the like is formed between the unit structure Z and the bottom plate 12. In addition, the circuit board C here is supported by the support members 70 and constitutes part of the unit structure Z.

[0061]

Since in the illumination device 100 configured as described,

the reflective plate 50 and the shielding member 60 are integrated,

by attaching them to the light sources 20, the reflective plate 50 is

arranged around the light sources 20 and also a structure in which

the sockets 20B is shielded by the shielding member 60 can be

obtained, improving assemblability. In addition, the unit

structure Z is constituted in which the light sources 20, the

reflective plate 50, the shielding member 60, and the circuit board

C are unitized, thus making it possible to simplify a structure and

further improve assemblability.

[0062]

Describing further another embodiment, the light sources in

the above-described embodiment are arranged in the posture in

which the outer circumferential surfaces of the containers are

opposite to the light extraction opening, and light emitted from

each of the light sources is configured to directly travel toward the

light extraction opening; however, the light emitted from each of

the light sources may be configured to be made to travel toward the

light extraction opening using, for example, a reflective mirror or

thelike.

[0063]

In further addition, the illumination device of the present

embodiment may be further provided with a relay board connected

with multiple light sources arranged in line.

Specifically, the relay board is one electrically connected

with electric cables connected to the sockets of the respective light

sources, and for example, by providing the relay board in the

containing space S, protection from heat can be provided.

[0064]

Also, in the above-described embodiment, a configuration in

which the light emitting parts are connected to the sockets is

described; however, the light emitting parts may be connected with

the electric cables without the sockets or the light emitting parts

may be connected to relay boards. In such a case, the electric

cables and the relay boards serve as the connected parts.

[0065]

In addition, the illumination device in the above-described

embodiment includes halogen lamps used for inspection

applications; however, without limitation to the inspection

applications, they may be used for a general purpose or the like,

and besides the halogen lamps, Krypton lamps, incandescent lamps,

UV lamps, or the like may be included.

[0066]

Besides, the present invention is not limited to the

above-described embodiments but can be variously modified without departing from the scope thereof.

Reference Signs List

[0067]

100 Illumination device

EL: Electric cables

10 Casing

X Light extraction opening

20 Light source

21 Filament

22 Container

221 Outer circumferential surface

20A Light emitting part

20B Socket

25 Tip

60 Shielding member

S Containing space

Industrial Applicability

[0068]

According to the present invention, in the illumination

device including the light sources using the filaments, it is possible

to make it easy to control the light condensability and uniformity of

light applied to an object, as well as to protect the connected parts

such as the sockets from heat, and to more flatten the intensity

distribution of the light applied to the object.

Claims

1. An illumination device comprising: multiple light sources

arrayed in one line or multiple lines; and a casing that contains the

light sources and is formed with a light extraction opening for

extracting light from the light sources, wherein

the light sources include light emitting parts adapted to

contain filaments in tubular containers and connected parts

connected with the light emitting parts, and are arranged in a

posture in which light emitted from outer circumferential surfaces

ofthe containers is extracted through the light extraction opening,

the illumination device further comprising a shielding

member that covers at least parts of the connected parts and

shields light traveling toward the connected parts after emission

from the light emitting parts,

the multiple light sources arrayed in one line or multiple

lines are arranged in a posture in which the outer circumferential

surfaces ofthe containers are opposite the light extraction opening,

the filaments are wound conductive wires;

the multiple light sources are arranged so that the filaments of the

respective light sources extend along and line up along an array direction of

the light sources; and

the light emitting parts, the connected parts, and the

shielding member are housed within the casing.

2. The illumination device according to claim 1, wherein

in a state where electric cables for supplying current to the

filaments are connected to the connected parts, the shielding

member covers at least parts of the electric cables and shields light

traveling toward the electric cables after the emission from the

light emitting parts.

3. The illumination device according to claim 1 or 2, wherein

the shielding member is an elongated one extending along an

array direction of the light sources, and covers the connected parts

ofthe respective light sources included in the one line.

4. The illumination device according to any one of claims 1 to

3, wherein

the shielding member is fixed to the casing, and the

connected parts are attached to the shielding member.

5. The illumination device according to any one of claims 1 to

4, wherein

the shielding member forms a containing space that contains

the connected parts and with respect to which air can flow in/out.

6. The illumination device according to any one of claims 1 to

5, wherein

the multiple light sources arrayed in one line or multiple lines are arranged in a posture in which an array direction and axial directions of the containers are orthogonal to each other.

7. The illumination device according to any one of claims 1 to

6, wherein

the multiple light sources arrayed in one line or multiple

lines are arranged in a posture in which tips of the containers face

in mutually a same direction.

8. The illumination device according to any one of claims 1 to

7, wherein

the multiple light sources arrayed in one line or multiple

lines are arranged in a posture in which tips of containers of

mutually adjacent light sources along an array direction face in

mutually opposite directions.

9. The illumination device according to any one of claims 1 to

8, wherein

the light sources are ones that emit light including an

infrared wavelength, and

the shielding member is formed of material that reflects

light having an infrared wavelength.

10. The illumination device according to any one of claims 1

to 9, further comprising a reflective member that is provided opposite to the light extraction opening and reflects the light emitted from the light emitting parts, wherein the reflective member is provided integrally with the shielding member.

11. The illumination device according to claim 10, wherein

the light sources, the reflective member, the shielding

member, and a circuit board that controls the light sources

constitute a unit structure in which they are integrated.

12. The illumination device according to claim 1, wherein

the connected parts are respectively formed with a mounting surface

opposite to the light emitting part;

the shielding member comprises a front wall which is arranged

opposite to the mounting surfaces of the connected parts.

CCS Inc.

Patent Attorneys for the Applicant/Nominated Person

SPRUSON& FERGUSON