Abstract: An optical multiplexer/demultiplexer and a manufacturing method thereof are disclosed, wherein a core is arranged on each side of a filter element, and the light is caused to enter the filter element from one of the cores without using a collimator lens. The loss of the transmitted light is reduced by optimizing the axial shift amount of the cores on the two sides. The optical axes of the cores 21, 23 located on both sides of the filter element 26 are displaced by ?. This axial shift amount ? is determined as A(?)•T•tan ?, where A(?) is a predetermined coefficient depending on the wavelength of the incident light, ? the angle between the optical axis of the incident light and the normal to the entrance surface of the filter element, and T the thickness in terms of a medium depending on the refractive indexes of the high refractive index layer and the low refractive index layer making up a multilayer film of the filter element.

Abstract: To provide an optical wave guide that may be produced by reproduction method in easy and simple manner, and has a structure that prevents light signal in its inside from leaking out from core, and a method for producing the same optical wave guide. A concave slot for forming a core is formed on the upper surface of a cladding substrate. And on both sides of the concave slot, cavities are formed via flat portions. An ultraviolet ray hardening type transparent resin is applied onto the surface of the cladding substrate, thereafter the transparent resin is pressed by a stamper. At this moment, a core is formed in the concave slot and excessive transparent resin is pressed between the stamper and the flat portions flows into cavities, as a result, it is possible to make the transparent resin thin in a short time. Thereby, it is possible to make the transparent resin left on the flat portions into thickness and width enough to prevent light in the core from leaking out.

Abstract: An optical multiplexer/demultiplexer and a manufacturing method thereof are disclosed, wherein a core is arranged on each side of a filter element, and the light is caused to enter the filter element from one of the cores without using a collimator lens. The loss of the transmitted light is reduced by optimizing the axial shift amount of the cores on the two sides. The optical axes of the cores 21, 23 located on both sides of the filter element 26 are displaced by ?. This axial shift amount ? is determined as A(?)•T•tan ?, where A(?) is a predetermined coefficient depending on the wavelength of the incident light, ? the angle between the optical axis of the incident light and the normal to the entrance surface of the filter element, and T the thickness in terms of a medium depending on the refractive indexes of the high refractive index layer and the low refractive index layer making up a multilayer film of the filter element.

Abstract: To provide an optical wave guide that may be produced by reproduction method in easy and simple manner, and has a structure that prevents light signal in its inside from leaking out from core, and a method for producing the same optical wave guide. A concave slot 3 for forming a core is formed on the upper surface of a cladding substrate 2. And on both sides of the concave slot 3, cavities 6 are formed via flat portions 5. An ultraviolet ray hardening type transparent resin 8 is applied onto the surface of the cladding substrate 2, thereafter the transparent resin 8 is pressed by a stamper 13. At this moment, a core 4 is formed in the concave slot 3 and excessive transparent resin 8 pressed between the stamper 13 and the flat portions 5 flows into cavities 6, as a result, it is possible to make the transparent resin 8 thin in a short time. Thereby, it is possible to make the transparent resin 8 left on the flat portions 5 into thickness and width enough to prevent light in the core 4 from leaking out.

Abstract: An optical scanner and an optical scanning device, an optical sensor unit, a coded data reader, and a POS system employing an optical scanner. The optical comprises an elastically deformable element, a vibrational input segment disposed at a first end of the elastically deformable element, a driven segment disposed at a second end of the elastically deformable element, a vibration source for inducing vibration in the vibrational input segment, whereby the vibration induced in the vibrational input segment produces elastic deformation of the elastically deformable element and consequent movement of the driven segment, and a stop for limiting a range of the movement of the driven segment.