Abstract:
A light source device includes an excitation light source which generates excitation light, a fluorescent member containing a fluorescent substance which absorbs the excitation light to generate fluorescence, an emitting side optical member which is provided on an emitting end face of the fluorescent member, and a reflector which is provided on the side surface of the fluorescent member. The reflector has an optical property of reflecting the excitation light and the fluorescence. The emitting side optical member has an optical property of reflecting the excitation light and transmitting the fluorescence.
Abstract:
An optical encoder is a reflecting triple grating type optical encoder. A light projecting section of the optical encoder which includes a combination of a bare chip LED and a first grating of a first pitch p1, irradiates a predetermined light. A photodetecting section of the optical encoder which includes a combination of a photodetector and a third grating of a third pitch p3 detects a movement of a self image. Each of the first grating and the third grating is disposed substantially parallel with respect to a scale, and a substantially parallel and substantially flat light transmitting area is formed in a predetermined portion of a surface of a detecting head. A light transparent member is disposed in a space between the surface of the detecting head, and the first grating and the second grating.
Abstract:
An optical encoder is a reflecting triple grating type optical encoder. A light projecting section of the optical encoder which includes a combination of a bare chip LED and a first grating of a first pitch p1, irradiates a predetermined light. A photodetecting section of the optical encoder which includes a combination of a photodetector and a third grating of a third pitch p3 detects a movement of a self image. Each of the first grating and the third grating is disposed substantially parallel with respect to a scale, and a substantially parallel and substantially flat light transmitting area is formed in a predetermined portion of a surface of a detecting head. A light transparent member is disposed in a space between the surface of the detecting head, and the first grating and the second grating.
Abstract:
In a triple slit optical encoder, a first grating and a third grating are formed on separate members, and values of a first effective width W1 and a first pitch p1 of an optical pattern on the first grating, and a third effective width W3 and a third pitch p3 of an optical pattern on the third grating are set to values such that a periodic signal having the amplitude effective for detection of a relative displacement of a scale is achieved based on periodicity of the self-image, refractive indices of substances of substances and/or spaces interposed in the optical path from a bare LED up to a photodetector, and the thickness of those substances and/or spaces in a direction substantially perpendicular to a plane on which the second grating is formed.
Abstract:
An optical displacement sensor comprises a surface emitting laser light source, a scale and a photosensor. The surface emitting laser light source emits a light beam having a predetermined shape. The scale is displaceable in such a manner as to cross the light beam emitted from the surface emitting laser light source and has a diffraction grating of a predetermined period formed thereon for forming a diffraction interference pattern from the light beam. The photosensor receives a predetermined portion of the diffraction interference pattern. The photosensor includes light intensity detecting means comprised of a plurality of light receiving areas arranged apart from one another in a pitch direction of the diffraction interference pattern on a light receiving surface at intervals of np1 (z1 +z2)/z1 where z1 is a distance between a light-beam emitting surface of the surface emitting laser light source and a surface on which the diffraction grating is formed, z2 is a distance between the surface on which the diffraction grating is formed and the light receiving surface of the photosensor, p1 is the pitch of the diffraction grating on the scale, and n is a natural number.
Abstract translation:光学位移传感器包括表面发射激光光源,刻度尺和光电传感器。 表面发射激光光源发射具有预定形状的光束。 标尺可以以与从表面发射激光光源发射的光束交叉的方式移位,并且具有形成在其上的预定周期的衍射光栅,用于从光束形成衍射干涉图案。 光传感器接收衍射干涉图案的预定部分。 光传感器包括光强度检测装置,其包括以np 1(z 1 + z 2)/ z 1的间隔在光接收表面上以衍射干涉图案的间距方向彼此分开布置的多个光接收区域,其中, z 1是表面发射激光光源的光束发射表面与其上形成衍射光栅的表面之间的距离,z 2是其上形成衍射光栅的表面与光接收表面之间的距离 的光电传感器,p 1是刻度上的衍射光栅的间距,n是自然数。
Abstract:
An optical displacement sensor comprises a surface emitting laser light source, a scale and a photosensor. The surface emitting laser light source emits a light beam having a predetermined shape. The scale is displaceable in such a manner as to cross the light beam emitted from the surface emitting laser light source and has a diffraction grating of a predetermined period formed thereon for forming a diffraction interference pattern from the light beam. The photosensor receives a predetermined portion of the diffraction interference pattern. The photosensor includes light intensity detecting means comprised of a plurality of light receiving areas arranged apart from one another in a pitch direction of the diffraction interference pattern on a light receiving surface at intervals of np1(z1+z2)/z1 where z1 is a distance between a light-beam emitting surface of the surface emitting laser light source and a surface on which the diffraction grating is formed, z2 is a distance between the surface on which the diffraction grating is formed and the light receiving surface of the photosensor, p1 is the pitch of the diffraction grating on the scale, and n is a natural number.
Abstract:
In a triple slit optical encoder, a first grating and a third grating are formed on separate members, and values of a first effective width W1 and a first pitch p1 of an optical pattern on the first grating, and a third effective width W3 and a third pitch p3 of an optical pattern on the third grating are set to values such that a periodic signal having the amplitude effective for detection of a relative displacement of a scale is achieved based on periodicity of the self-image, refractive indices of substances of substances and/or spaces interposed in the optical path from a bare LED up to a photodetector, and the thickness of those substances and/or spaces in a direction substantially perpendicular to a plane on which the second grating is formed.
Abstract:
Current blocking layers are provided on whole both side surfaces of a mesa stripe structure to control a transverse mode of light in active and window sections. In a longitudinal direction of a laser cavity, an active layer and optical guiding layers are coupled by taper like optical waveguides. As a result, a low loss coupling and a high optical radiation power are obtained in a self-alignment type window semiconductor laser according to the invention. Further, a wafer surface is flatted, after the regrowth of the window sections, so that the window sections and an active section are simultaneously processed in regard to an optical transverse mode. As a result, a fabricating process is simplified in the invention.
Abstract:
An optical encoder includes a scale which is installed on one member of which, displacement is detected, and a detecting head which is installed on the other member which moves relatively with respect to the one member, and is disposed facing the scale. A predetermined optical pattern in a direction of relative movement is provided, and the detecting head includes a light emitting section which irradiates a predetermined light on the scale, a light detecting section which includes a light receiving surface which receives light through the optical pattern, which is irradiated on the scale from the light emitting section, and which detects light distribution formed on the light receiving surface, a first light transmitting member which is disposed in an optical path between the light emitting section and the scale, and a second light transmitting member which is disposed in an optical path between the scale and the light detecting section. The optical encoder further includes a stray-light reduction element which is interposed between a surface of the first light transmitting member and a surface of the second light transmitting member, and which reduces stray light which does not contribute to signal detection.
Abstract:
A light source device includes an excitation light source which generates excitation light, a fluorescent member containing a fluorescent substance which absorbs the excitation light to generate fluorescence, an emitting side optical member which is provided on an emitting end face of the fluorescent member, and a reflector which is provided on the side surface of the fluorescent member. The reflector has an optical property of reflecting the excitation light and the fluorescence. The emitting side optical member has an optical property of reflecting the excitation light and transmitting the fluorescence.