Submicron precision using original molding and polishing technology
Technology and skills honed during more than 50 years of production and development.
We give new added value to products by taking advantage of the characteristics of ceramic parts, which have excellent abrasion resistance and heat resistance.
Jewels for Bearings and Watches
With the super-precision processing technology that has evolved as a core technology for over 50 years, we run integrated production from powder material to molding, firing and processing.
It is used not just for the bearings in wrist watches, but for those in measuring instruments, compact fan motors, compact vibration motors, precision equipment, and other products too.
We can produce miniature magnets smaller than 1 mm in size, with high accuracy. Making full use of each attribute of magnet, it is used for various applications such as motors.
We are making efforts to reduce the quantity of rare earth elements used by generating near net shapes (molding close to the shape of the completed product) using super-precision molding technology, which decreases the allowance for processing in later processes.
Magnet Characteristics Table
Magnetic field direction
Right-angle magnetic field press
Necessary magnetization field
Reversible temperature coefficient
Coefficient of thermal expansion
Optical Communication Device Components
We manufacture optical communication components such as high-precision, high-quality ceramic split sleeves and precision sleeves using the ceramic molding technology and super-precision polishing technology for bearings that we are proud of.
We also manufacture pin gauges for inspection in house by utilizing centerless machining technology developed in the manufacture of ferrules.
Adapters for optical communications
Optical connection boxes
Receptacles for optical transceivers
Lapping / Polishing
SiAlON is a ceramic material based on silicon (Si) and also comprising aluminum (Al), oxygen (O) and nitrogen (N), and the name was derived by combining the initial letters of the component elements.
Its major characteristics are high hardness, high toughness that means it does not crack easily, combined with excellent heat resistance and abrasion resistance.
With a specific gravity less than half that of iron, it is lighter than even titanium with a specific gravity of 4.5, and it can substitute for other metals in terms of function.
Added to that, our company’s strength is the ability to manufacture products matched to the application by combining Citizen Finedevice’s unique processing technologies to control the hardness and toughness values.
Good thermal characteristics and very stable
Good mechanical characteristics and excellent abrasion resistance
Achieves high strength with pressureless sintering. Reflected in very low manufacturing costs
Extremely low level of unreacted components because this is a product made by firing SiAlON raw materials
Compact precision sliding bearings
Exceptional Durability, Abrasion Resistance and Environmental Resistance
Our original blended-raw-material ceramics can be used in a variety of situations, being very strong but light, usable in high-temperature, high-humidity environments because they show little thermal distortion, and not easily scratched even if they make contact with moving parts.
We mix and crush the raw materials of alumina and zirconia with a binder and make the optimum granules for our press processing with a slate dryer.
This makes it possible to increase dimensional accuracy and strength.
And we provide products with characteristics suited to their application by controlling the strength and toughness values of the new material SiAlON using our unique blending.
Precision Inner Diameter Machining with Our Original Wire
In order to improve inner diameter accuracy, which is the key for bearings, we manufacture wire used for super-precision processing with our original wire manufacturing technology.
Particularly in the processing of split sleeves for optical communications, with strict dimensional accuracy requirements, we meet the customers’ requirements by controlling the accuracy of the processing wire to within 1 μm, and using dedicated in-house manufacturing machines.
We also handle olive processing using wires.
Various molding techniques and sintering
The granules made using our unique blending can be molding into ultra-small ceramic products by powder pressing, extrusion molding, CIP, etc.
In addition, these forms of near net shape molding reduce machining allowances while also realizing super-precision processing.
We also manufacture anisotropic sintered magnet products using a molding unit in a magnetic field.
Sintering after molding is carried out under the optimal conditions depending on the characteristics of each material - for example atmospheric air, vacuum, or nitrogen atmospheres - as well as temperature control, to generate products with few defects.
From optical thin film products to thin film metallization, various film forming technologies are utilized to form films that meet the requirements for glass, crystal, ceramic, silicon and other substrates.
Film formation method
Au, Ag, Al, Cr, Ti, Ni, Sn, Pt, Cu, Pd, Ge, Si, Ag alloy and other binary alloy can be produced
AlN, Al2O3, SiC, Si, Crystal, various glasses, various resins, various ceramics
Antireflective coating (AR), Reflector, UV / IR cut filter, Dichroic, Polarization beam splitter, ND filter, Super multilayer dielectric mirror and other various filters
Crystal, various glass, Si
High reflecting coating
Al mirror, Au mirror, Ag mirror
AlN, AAl2O3, ASiC, ASi, ACrystal, various glasses, various resins, various ceramics
Various metal oxide + nitride
Water-repellent oil-repellent Court
High-precision patterning of various thin films can be achieved by using photolithography with chromium masks. The lift-off method or etching method is used depending on the thin film material and the product application. In addition, either wet or dry etching can be selected.
Lapping / Polishing
We have achieved high-precision lapping/polishing by applying single-sided and double-sided lapping/polishing technology developed through experience with crystal blanks, thin-film magnetic heads and optical glass processing, to ceramic materials.We can also round edges and polish curved parts to a mirror finish by using our original compound abrasives.