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  • Eco-Drive

    THE WATCH THAT NEVER STOPS, WHEREVER YOU ARE.

    Inventing technology to ensure that a watch never stops anywhere in the world was one of the challenges for CITIZEN. In 1976, we invented the world’s first light-powered analogue quartz watch that uses only light as a power source.

    This technology, now known as “Eco-Drive,” can generate power from any light source, artificial, natural and even dim light to keep watches running without ever replacing batteries. As a pioneer of the field, we set new challenges for ourselves to bring forth the full potential of power generation using light.

    CITIZEN’s Eco-Drive technology has won acclaim in Japan for its contribution to environmental protection. In 1996, an Eco-Drive watch was nominated as the first watch to qualify for the Eco Mark, a label managed by the Japan Environment Association (JEA). In 2014, CITIZEN became the first watchmaker to receive a Gold Prize in the JEA’s Eco Mark Awards

    Easy to Charge Even in Dim Light

    Eco-Drive is designed so that any light source, no matter how dim, will generate the energy needed to power the watch. Light itself is the only energy source required to tell the time with an Eco-Drive watch.

    Easy to Charge Even in Dim Light

    Eco-Drive is designed so that any light source, no matter how dim, will generate the energy needed to power the watch. Light itself is the only energy source required to tell the time with an Eco-Drive watch.

    A Material Designed for Scratch Resistance and Comfort Wearing

    CITIZEN has always striven to innovate. When it comes to the materials we use, we take the same approach.

    In 1970, we launched the world’s first watch using solid titanium that is lightweight, hypoallergenic and resistant to rust.

    We processed solid titanium and then treated it with our proprietary surface hardening technology, Duratect, to create Super TitaniumTM.

    Achieving more than 5 times the hardness of stainless steel and providing better wearing comfort, Super TitaniumTMrepresents our commitment to providing people with something better.

    Darkness Is Not a Concern

    One of the factors that distinguishes CITIZEN’s Eco-Drive from other methods of keeping watches running at all times is its “power life.” Most Eco-Drive watches continue running for more than six months on a full charge, even in total darkness. Thanks to our power saving function, we make watches that can operate for up to even seven years without light.

    Light-Powered Generation

    Eco-Drive efficiently converts any light, including artificial, natural and even dim light, into energy. CITIZEN has focused its development efforts on two different types of solar cells.

    Standard Solar

    This is the most commonly used solar cell in our watches today. It converts light into energy with high efficiency because it sits under the dial.

    Ring Solar

    This ring-shaped solar cell wraps around the dial and also converts light into energy efficiently. It allows more design flexibility on the dial, as the dial surface does not need to be transparent to allow light to pass through.

    Saving Energy

    CITIZEN has dedicated itself to improving its technologies to develop power efficient watch movements. Our pursuit of innovation has allowed us to bring to the market many light-powered watches with advanced functions and designs.

    Insufficient Charge Warning

    When an Eco-Drive watch with this feature has an insufficient charge, the second hand jumps in 2-second intervals. Once the battery is fully charged, the second hand returns to normal operation.

    Power-Save Feature

    When an Eco-Drive watch with this feature is left in the dark, the hands stop in order to save energy. Once light hits the watch, the hands move quickly and automatically to catch up to display the current correct time.

    We continue to work on enhancing semiconductor chips, circuits and motors in our watches to even further reduce the power consumption of watch movements.

    Light-Level Indicator

    CITIZEN invented the world's first,∗ Light-Level Indicator for analogue watches. It detects the intensity of light striking the dial and displays the electricity generation level at the moment, allowing wearers to easily gauge the charge level in any given situation.

    ∗According to research by CITIZEN WATCH CO., LTD.

  • Super Titanium™

    Harder Materials, Fewer Scratches

    Keeping your watch scratch free and undamaged doesn’t mean you have to hide it away in your dresser. Super TitaniumTMprovides the ideal solution to the “beauty vs. preservation” dilemma

    Thanks to CITIZEN’s proprietary surface hardening technology, Duratect, watches made of Super TitaniumTM are incredibly resistant to everyday wear and tear.

    Super TitaniumTMTM is more than 5 times harder than Stainless Steel

    Stainless Steel

    Super TitaniumTM(Duratect TIC)

    Scratch comparison test by CITIZEN WATCH CO., LTD.

    Light, for Better Comfort

    Super TitaniumTM is approximately 40% lighter than Stainless Steel. It’s so light that you almost forget you’ve got a watch on at all. And it feels good on your wrist, whatever you’re doing.

    Super TitaniumTM is approximately 40% lighter than Stainless Steel

    Stainless Steel

    Super TitaniumTM

    Note: Comparison of watch models with the same design, one made of Stainless Steel and the other of Super TitaniumTM.

    A Gentle Metal That’s Kinder on Your Skin.

    Super TitaniumTM reduces the risk of adverse skin reaction to metals thanks to the use of hypoallergenic solid titanium and CITIZEN’s proprietary surface hardening technology. And that’s true even for people with unusually sensitive skin.

    Note: Super TitaniumTM does not prevent all allergic reactions to metal.

    More Resistant to Corrosion, for Lasting Beauty

    Super TitaniumTM is more resistant to corrosion even when it comes to contact with salt water.

    Wherever you are and whatever you do, you can rely on Super TitaniumTM to ensure your watch looks its best.

    ∗ The pins used for the band may tarnish. CITIZEN recommends regular cleaning.

    Technologies

    Titanium is the fourth most abundant structural metal on Earth. An incredible material that does not react to sunlight, salt water, or human body chemistry, it reduces the possibility of metal allergic reaction and is corrosion resistant.

    Pressing

    Titanium is an active metal that reacts easily with oxygen, carbon, nitrogen, and other elements. Titanium atoms have a tendency to adhere to, and fuse with the metal molds used in pressing. To prevent the titanium sticking to the mold and to make it easier to shape, CITIZEN altered its qualities by heating it to a high temperature before pressing. This innovation considerably reduced its resistance to shaping—and opened up numerous possibilities.

    Polishing

    Polishing is yet another hurdle when using titanium for watchmaking. Owing to slight variations in the hardness of the crystal grains that form titanium, the conventional polishing process creates surface irregularities likely to mar the sheen of a watch. At CITIZEN we combine a number of polishing techniques, including barrel and Sallaz polishing, to achieve superior surface quality for our watches made of Super TitaniumTM.

    Surface Hardening Technology: Duratect

    CITIZEN’s proprietary technology, Duratect, was developed to harden the surface of watch materials.

    Machinery for Duratect treatment

    CITIZEN has various ways of surface harfening materials. It provies a range to surface hardness (up to more than five times the surface hardness of Stainless Steel) while at the same time, colouring the watches in silver, black, and gold, which were once thought impossible.

    The Vickers hardness test involves measuring the hardness value of the surface of a material by forcing a diamond indenter into it. It is very widely used, including as a basis for other hardness tests.

    Note that the test only measures the hardness value of the surface coating with a low load. The Vickers hardness test is not designed as a measurement to indicate scratch resistance in an everyday context.

    Surface Hardness and Variations in CITIZEN’s Surface Hardening Technology, Duratect.

    Colour Variations of Watch Cases Made of Super TitaniumTM

    Story

    Exploring Ideal Materials for Watches

    The origins of Super TitaniumTM stretch back to the 1960s, when the Apollo moon mission first revealed titanium’s potential as an industrial material. Inspired by this glimpse of the future, CITIZEN engineers set about exploring how they could apply titanium to watch manufacturing

    The First Titanium Watch

    In 1970, we produced the X-8 Chronometer, the world’s first watch with a solid titanium case. The name expressed our high hopes for titanium and its infinite possibilities as a material.

    1970

    Titanium Watches for Everyone

    CITIZEN was impressed with titanium’s hypoallergenic properties. In fact, we made it our mission to create innovative watches that were safe and gentle on the skin, so that everyone could enjoy wearing a watch.

    The Attesa, introduced in 1987, was an all-titanium hypoallergenic watch created in-house.

    1987

    Super TitaniumTM, a CITIZEN original

    CITIZEN wanted to explore titanium’s infinite possibilities as a material for watchmaking. It was never going to be easy. But we met the challenge by creating our own titanium-processing technology, and following that up with our proprietary surface hardening technology, Duratect. The challenge goes on in line with the spirit of “Better Starts Now”, as we look forward to making future breakthroughs. Improvements in our titanium-processing technology have enabled our designers to create a wide range of great designs. Thanks to advances in our surface-hardening technology, we have also succeeded in creating models with higher resistance to scratches in a wide range of colours and with stronger hypoallergenic properties.

    We are on a never-ending journey to provide everyone, everywhere, with the chance to wear a beautifully designed and comfortable watch. This was the dream that first led the team at CITIZEN to develop Super TitaniumTM—and it still drives us today, as we address the challenges that come up en route to creating ever better timepieces.

    1982

    Titanium diver watch with the world’s highest∗ water pressure resistance to the depth of 1,300 meter

    ∗At the time of release in 1982

    1993

    All-titanium metal allergy resistant watch

    1994

    Platinum-plated titanium watch

    2000

    The first titanium watch treated with Duratect

    2006

    The first titanium watch treated with Duratect MRK+DLC

    Note : There are models which are no longer in production or not available in some markets.

  • Satellite Wave and Radio-Controlled Technology