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2 July 2010
Web/E-mail Server problem

Due to our server failure, our Web/E-mail were out of service from 1:00 to 19:42 on 2 July 2010 (JST)

If you sent e-mail messages during this period, and received error messages, please re-send your messages to us.

We apologise for any inconvenience caused.

8 May 2010
Additional Linear Prism "LP75" now on our product list

Nihon Tokushu Kogaku Jushi Co., Ltd. (NTKJ) is delighted to announce that "LP75" has been added to our product line up.

The new "LP75" is designed to bend light beam from a light source such as LEDs by reflecting at the slope of the LP75. A diagram below shows how LP75 bend light beam. As this diagram shows, LP75 has 75 degree apex angles with 52.5 degree inclination angles on both sides. A relation ship between incidence and output angle is stated below.

Incident angle (degree) 85 80 75
Output angle (degree) 2 7 11


LP75 size is 200mm x 200mm and 2mm thickness as standard. The standard material PMMA and thickness can be modified at small extra cost.

Please refer to our products page for more details.

28 Aug 2009
Additional Linear Fresnel lens for LED lighting

Nihon Tokushu Kogaku Jushi Co., Ltd. (NTKJ) is delighted to announce that "LF15" ,"LF20"and "LF25 " have been added to our product line up. The new three products' can be used for lighting application and as a part of inspection devices.

The new "LF15","LF20" and "LF25" are designed to collimate light beam from a point light source such as LEDs. These products lengths are 450mm in order to cover aligned LED lighting application.

Please refer to our products page for more details.

21 July 2009
Summer holiday at NTKJ

Nihon Tokushu Kogaku Jushi Co., Ltd. (NTKJ) will be in Summer holiday from 12th until 16th of August. We are still accepting enquiries via our website during this period, but replies will be after 16th August.

5 Jun 2009
Additional Fresnel lenses for solar concentrator now on our product list

Nihon Tokushu Kogaku Jushi Co., Ltd. (NTKJ) is delighted to announce that "CF150-B" and "CF600-B" have been added to our product line up. As a result, our fresnel lenses line up for solar concentrator range is from small to large sizes in order to satisfy our customers' needs.

22 Sep 2008
LF1000-BH Linear Fresnel lenses for solar concentrator added to our product list

Nihon Tokushu Kogaku Jushi Co., Ltd. (NTKJ) is delighted to announce that "LF1000-BH" has been added to our product line up. LF1000-BH is a fractionized linear Fresnel lens and it has a focal length of 1000 mm. The size of one segment is 500 x 500 mm, and of 3 mm thickness, when two pieces are connected, they will form one 1000W x 500L linear Fresnel lens.

1 Aug 2008
Summer holiday at NTKJ

Nihon Tokushu Kogaku Jushi Co., Ltd. (NTKJ) will be in Summer holiday from 13th until 17th of August. We are still accepting enquiries via our website during this period, but replies will be after 17th August.

21 April 2008
National holiday in May

Nihon Tokushu Kogaku Jushi Co., Ltd. will be closed as below due to Japanese national holidays in May. We still accept enquiries via our website during this period. We will reply to enquiries soon after the holidays.

May holiday at NTKJ
1 May 2008 - 6 May 2008

30 Jan 2008
Linear Fresnel lenses for solar concentrator now on our product list

Nihon Tokushu Kogaku Jushi Co., Ltd. (NTKJ) is delighted to announce that "LF150-B" has been added to our product line up. As a result, our fresnel lenses line up for solar concentrator ranges are for both circular and liner format in order to satisfy our customers' various solar application needs such as heat collector pipes and solar photovoltaics.

3 Dec 2007
Small and medium Fresnel lenses for solar concentrator now on our product list

Nihon Tokushu Kogaku Jushi Co., Ltd. (NTKJ) is delighted to announce that "CF50-B" and "CF400-B" have been added to our product line up. As a result, our fresnel lenses line up for solar concentrator range is from small to large sizes in order to satisfy our customers' needs.

3 Aug 2007
Summer holiday at NTKJ

Nihon Tokushu Kogaku Jushi Co., Ltd. (NTKJ) will be in Summer holiday from 11th until 16th of August. We are still accepting enquiries from our website during this period, but replies will be after 17th August.

24 July 2007
Fresnel lenses for solar concentrator now on our product list

Nihon Tokushu Kogaku Jushi Co., Ltd. (NTKJ) is delighted to announce that "CF1200-B2" and "CF1200-B3" have been added to our product line up. These lenses are ideal for concentrating solar energy.

17 May 2007
The Wakasa Wan Energy Research Center has embedded our fresnel lens in their solar furnace system

Nihon Tokushu Kogaku Jushi Co., Ltd. (NTKJ) is delighted to announce that The Wakasa Wan Energy Research Center (WERC) has adopted our large fresnel lens for their innovative solar furnace project.

The solar furnace system is consist of our large 1300mm x 1300mm x t5mm Fresnel lens, which has been divided in 9 pieces. The furnace is able to produce more than 10kW/2500 °C at the focal point.

Please refer to WERC's website for more project details. (http://www.werc.or.jp).

Solar Fresnel Lens

28 April 2007
National holiday in May

Nihon Tokushu Kogaku Jushi Co., Ltd. (NTKJ) will be closed as below around Japanese national holidays in May. We still accept enquiries via our website during this period. We will reply to enquiries soon after the holidays.

May holiday at NTKJ
28 April 2007 - 6 May 2007

28 April 2007
Website renewal

Nihon Tokushu Kogaku Jushi Co., Ltd. (NTKJ) launched the new website.

March 2007
Additional Linear Fresnel lenses

Nihon Tokushu Kogaku Jushi Co., Ltd. (NTKJ) added short focal length Linear Fresnel Lens products to its line-up. Please refer to our products page for more details.