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Patent Issued for Light Irradiating Device (USPTO 10012825)

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07/12/2018 | 11:46pm CEST

By a News Reporter-Staff News Editor at Journal of Engineering -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventor Kogure, Yasuo (Toda, JP), filed on March 14, 2017, was published online on July 3, 2018.

The assignee for this patent, patent number 10012825, is Hoya Candeo Optronics Corporation (Toda-Shi, Saitama, JP).

Reporters obtained the following quote from the background information supplied by the inventors: "In the related art, as an offset sheet-fed printing ink, an ultraviolet curable ink which is hardened by irradiating an ultraviolet ray is used. Further, recently, when printing is performed on a material which is hardly dried such as metal or plastic, other than paper, an ultraviolet curable ink is used to quickly dry the ink and increase productivity per hour. In order to harden the ultraviolet curable ink, generally, an ultraviolet ray irradiating device which irradiates an ultraviolet ray is used.

"As the ultraviolet ray irradiating device, a lamp type irradiating device using a high pressure mercury lamp or a mercury xenon lamp as a light source has been known in the related art. For example, in Patent Document 1, a configuration in which light is irradiated on a workpiece conveyed by a conveyer belt by a lamp type irradiating device to harden the ultraviolet curable ink on a surface of the workpiece is disclosed.

"Recently, due to demands for reducing power consumption, increasing a life span, and compacting a device size, an ultraviolet ray irradiating device which uses an LED as a light source, instead of a discharge lamp of the related art, has been developed. The ultraviolet ray irradiating device using the LED as a light source, for example, is disclosed in Patent Document 2 and a plurality of substrates on which a plurality of light emitting diodes (LEDs) is mounted is arranged to have a straight line shape to obtain a linear ultraviolet ray."

In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventor's summary information for this patent: "According to a configuration disclosed in Patent Document 1, when the ultraviolet curable ink is applied only on a top surface of the workpiece, the ultraviolet irradiating device is disposed to be opposite to the top surface of the workpiece and an ultraviolet ray is irradiated from one direction to harden the ultraviolet curable ink. However, in the case of a workpiece (an irradiating object) having a three-dimensional shape such as a beer or juice can, a PET bottle, or a shampoo or cosmetic bottle, it is necessary that an ultraviolet ray is irradiated from a plurality of directions (for example, a front side, a rear side, a right side, and a left side of a conveying direction) according to a shape of a surface on which the ultraviolet curable ink is applied or the ultraviolet ray is irradiated while rotating the workpiece.

"As a configuration which irradiates an ultraviolet ray on a workpiece from a plurality of directions, a configuration in which a plurality of ultraviolet irradiating devices is disposed to enclose the workpiece may be considered. However, according to this configuration, when the ultraviolet irradiating device is disposed at the front side and the rear side of the conveying direction of the workpiece, the workpiece cannot be conveyed. Accordingly, in order to irradiate an ultraviolet ray on the front side and the rear side of the conveying direction of the workpiece, the ultraviolet ray is irradiated while stopping the workpiece in a space enclosed by a plurality of ultraviolet irradiating devices. However, when the workpiece stops, the production efficiency may be deteriorated.

"In the case of a configuration which irradiates the ultraviolet ray while rotating the workpiece, a device which rotates the workpiece while supporting the workpiece is necessary, so that the entire device becomes complex and a size of the device is also increased.

"The present invention has been made in an effort to provide a light irradiating device which irradiates an ultraviolet ray on a three-dimensional irradiating object which moves in one direction, not only from a side of a conveying direction, but also from the front side and the rear side.

"An exemplary embodiment of the present invention provides a light irradiating device which irradiates an ultraviolet ray on a three-dimensional irradiating object which relatively moves along a first direction to harden an ultraviolet curable resin applied on a surface of the irradiating object. The light irradiating device includes a plurality of LED elements which is disposed on a substrate along the first direction and irradiates the ultraviolet ray on the irradiating object; and a plurality of light collecting units which is disposed in an optical path of each LED element and forms the ultraviolet ray emitted from each LED element to have a narrow spread angle, and the ultraviolet ray which passes through the light collecting unit to be directed to the irradiating object has a first light distribution peak which is inclined to an upstream side of the first direction at a first angle and a second light distribution peak which is inclined to a downstream side of the first direction at a second angle, with respect to a second direction which is perpendicular to the first direction.

"According to this configuration, the ultraviolet ray which is irradiated onto the irradiating object has a first light distribution peak and a second light distribution peak inclined with respect to the second direction so that the ultraviolet ray may be irradiated onto the irradiating object not only from a side of a conveying direction, but also from a front side and a rear side.

"The plurality of LED elements and the plurality of light collecting units may have a common optical axis which is parallel to the second direction, and light irradiating device may further include a light distribution control unit which includes a first incident surface inclined toward the upstream side of the first direction with respect to the optical axis and a second incident surface inclined toward the downstream side of the first direction and emits the ultraviolet ray emitted from the plurality of light collecting units by being refracted at the first angle and the second angle. Further, in this case, the first incident surface and the second incident surface may be alternately formed along the first direction. Further, in this case, the plurality of LED elements may be disposed with a predetermined interval along the first direction and the first incident surface and the second incident surface may be alternately formed with the predetermined interval so as to correspond to each LED element.

"The plurality of LED elements may be disposed with a predetermined interval along the first direction and the first incident surface and the second incident surface may be formed with an interval which is smaller than the predetermined interval.

"The plurality of LED elements may be disposed with a predetermined interval along the first direction and the first incident surface and the second incident surface may be formed with an interval which is larger than the predetermined interval.

"The light distribution control unit may be a prism.

"Each of the LED elements and each of the light collecting units may configure an LED module and the LED modules may be configured by a first LED module having an optical axis inclined at the first angle with respect to the second direction and a second LED module having an optical axis inclined at the second angle with respect to the second direction.

"Each of the LED elements and each of the light collecting units may have a common optical axis and an attached surface of the first LED module and the second LED module may be inclined with respect to the second direction.

"Each of the LED elements and each of the light collecting units may have different optical axes and an attached surface of the first LED module and the second LED module may be a plane perpendicular to the second direction.

"The light collecting unit may be configured to divide the ultraviolet ray emitted from each of the LED elements into light at the first angle and light at the second angle.

"The light collecting unit may be a light collecting lens or a light collecting mirror.

"As described above, according to the present invention, it is possible to implement a light irradiating device which irradiates an ultraviolet ray on a three-dimensional irradiating object which moves in one direction, not only from a side of a conveying direction, but also from the front side and the rear side.

"The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description."

For more information, see this patent: Kogure, Yasuo. Light Irradiating Device. U.S. Patent Number 10012825, filed March 14, 2017, and published online on July 3, 2018. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=10012825.PN.&OS=PN/10012825RS=PN/10012825

Keywords for this news article include: Asia, Japan, Business, Hoya Candeo Optronics Corporation.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2018, NewsRx LLC

(c) 2018 NewsRx LLC, source Science Newsletters

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