Photoelectrical encoder employing an optical grating

Patent · Tue Feb 12 00:00:00 EST 1985

OSTI ID:5456608

Kabaya, Y

A photoelectrical encoder is disclosed wherein a physical quantity is detected from brightness obtained by moving a first and a second scale. Each scale is provided thereon with an optical grating relative to each other. The grating in one of the scales is constructed such that a first signal lead-out material layer made of a light shielding conductive material, a PN semiconductor layer for converting light into electricity, and a second signal lead-out material layer made of a light transmitting conductive material are laminated on a light transmitting base member to form a narrow belt-shaped light receiving portion and a plurality of narrow belt-shaped light receiving portions arranged at regular pitches. Against the light from the light transmitting base member, the light receiving portions function as light shielding slits, and intervals between the light receiving portions are formed into light transmitting slits.

• Assignee: Mitutoyo Mfg. Co. Ltd. (Japan)
• Patent Number(s): US 4499374
• OSTI ID: 5456608
• Resource Relation: Patent Priority Date: Priority date 21 May 1982, Japan; Other Information: PAT-APPL-380818
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
PHOTOELECTRIC CELLS
N-TYPE CONDUCTORS
OPTICAL SYSTEMS
P-TYPE CONDUCTORS
FABRICATION
LENSES
LIGHT SOURCES
LIGHT TRANSMISSION
MOS TRANSISTORS
DIRECT ENERGY CONVERTERS
MATERIALS
RADIATION SOURCES
SEMICONDUCTOR DEVICES
SEMICONDUCTOR MATERIALS
TRANSISTORS
140501* - Solar Energy Conversion- Photovoltaic Conversion