Specialty Glass : Products & Services

Optical Glass and Lens Pressings

Since 1941, HOYA has been a premier provider of optical glasses. Over the years, this traditional material business has transformed into a key element in the development of advanced electronics and information technologies.

HOYA has invested heavily in technical innovation to satisfy advanced requirements as well as to increase our commitment to environment preservation. Such commitments include the removal of lead, arsenic and other non-environmentally friendly chemicals. Our goal is to leverage our technology to fulfill our customers' needs, while contributing to the environment and society.


Pressed Blanks

Following three types of production method:

Direct Pressed Blanks (DP)
Direct pressed blanks are formed by fully automatic process of direct casting and pressing. The DP product is superior to the RP product in dimensional accuracy in outside diameter thickness, etc., and can be supplied with edge thickness at a fixed dimension.

New Direct Pressed Blanks (NDP)
New direct pressing is formed by a fully automatic process using a special weight control method. The NDP product is a superior in thickness accuracy and can significantly reduce grinding waste.

Re-heat Pressed Blanks (RP)
Re-heat pressed blanks are formed by a manually press method through a glass cutting and glass softening process.

Rolled and Sliced Blanks (RS)

Rolled and Sliced blanks are formed from glass rod material which has been precisely rounded off and sliced. The RS product is superior to pressed blanks in dimensional accuracy in outside diameter, thickness, etc.

Specially fabricated blanks

Custom glass, ground or sliced lens, and miscellaneous shapes for special applications.

Extruded Bar (E-bar)

Two opposite sides, though not polished, permit visual internal inspection, and the remaining four sides are fire-polished or as cast.

New Glass Type

Compared to FCD1, FCD10 has lower dispersion. It also has large negative abnormal partial dispersion in the long wavelength band, as well as a large positive abnormal partial dispersion in the short wavelength band. This means greater flexibility of optical design and easier correction of chromatic aberrations over a wide range of wavelength.

LBC3N features both a very small photoelastic coefficient and is athermal (temperature insensitive). Thus, in an optical system where the temperature changes, generation of birefringence and change in optical path length are restricted. Conventional glass with a small photoelastic coefficient contains much lead oxide, but LBC3N glass has no lead. This lack of lead oxide also makes the glass less tinted.

Furthermore, LCB3N has a large abnormal partial dispersion, which enables greater flexibility of optical design.

Note: The listed data are standard value. Because of continuous product improvement, the various data listed are subject to change without notice.