摘要:
The present invention aims to provide a CATV converter which can receive both of analog and digital signals. The CATV converter comprises a second mixer (10) coupled with a first filter (13) which attenuates approximately equal frequency to an audio carrier of an upper adjacent channel and approximately equal frequency to a video carrier of a lower adjacent channel, a first amplifier (14) coupled with an output terminal of the first filter (13), and a second filter (15) coupled with the output terminal of the first amplifier (14). The second filter (15) attenuates a video carrier of the upper adjacent channel and an audio carrier of the lower adjacent channel. When an input signal is within a predetermined frequency range, the input signal fed to the input terminal (1) can short-circuit the input and output terminals of the second filter with a high frequency of the input signal.
摘要:
A method for producing a lithium tantalate single crystal comprises the steps of preparing a melt consisting essentially of lithium tantalate in a platinum-rhodium crucible including 20 to 40 weight percent of rhodium, and growing a lithium tantalate single crystal from the melt in an oxidizing atmosphere, for example, in the atmosphere.
摘要:
An imaging lens includes an aperture stop ST, a first lens L1 that is shaped to form a meniscus lens that directs a convex surface to the object side near an optical axis and has positive refractive power, a second lens L2 that is shaped to form a meniscus lens that directs a convex surface to the object side near the optical axis and has negative refractive power, a third lens L3 that is shaped to form a meniscus lens that directs a concave surface to the object side near the optical axis and has positive refractive power, and a fourth lens L4 that is shaped to form a meniscus lens that directs a convex surface to the object side near the optical axis, arranged in this order from an object side to an image side. When the first lens L1 has a focal length f1 and the second lens L2 has a focal length f2, the imaging lens is configured such that a relationship 0.3
摘要翻译:成像透镜包括孔径光阑ST,第一透镜L1,其被成形为形成朝向光轴附近的物体侧的凸形表面并具有正折光力的弯月形透镜;第二透镜L2,其被成形为 弯曲透镜,其将凸表面引导到靠近光轴的物体侧并具有负折光力;第三透镜L3,其被成形为形成弯曲透镜,其将凹面指向靠近光轴的物体侧并且具有正折射率 功率以及第四透镜L4,其被成形为形成从物体侧到像侧依次布置的凸起表面朝向光轴附近的物体侧的弯月形透镜。 当第一透镜L1具有焦距f1并且第二透镜L2具有焦距f2时,成像透镜被配置为使得满足关系0.3 <| f1 / f2 | <0.7。
摘要:
An imaging lens includes a first lens having positive refractive power; a second lens having negative refractive power; a third lens having positive refractive power; and a fourth lens having positive refractive power, arranged from an object side to an image plane side. In the first lens, a curvature radius on an object-side surface is positive and a curvature radius of an image-side surface is negative. In the second lens, curvature radii of an object-side surface and an image-side surface are both positive. In the third lens, curvature radii of an object-side surface and an image-side surface thereof are both negative. When the whole lens system has a focal length f and a distance from the object-side surface of the first lens to an image-side surface of the fourth lens is L14, the imaging lens satisfies the following expression: 0.5
摘要:
An imaging lens includes a first lens L1 that has a biconvex shape near an optical axis and has positive refractive power, a second lens L2 that has a biconcave shape near the optical axis and has negative refractive power, a third lens L3 that has a shape of a meniscus lens directing a concave surface thereof to an object side near an optical axis and has positive refractive power, and a fourth lens L4 that has a biconcave shape near the optical axis and has negative refractive power, arranged in this order from the object side. When the whole lens system has a focal length f and the fourth lens L4 has a focal length f4, the imaging lens of the invention satisfies the following expression: −0.7
摘要:
An imaging device includes a light source; a prism having an imaging surface to be contacted with an object; and an image-forming optical system that forms an image of the object. The image-forming optical system includes a front lens group having a first optical axis tilted relative to the imaging surface; an image plane tilted from a surface perpendicular to the first optical axis of the front lens group; and a rear lens group having a second optical axis shifted in parallel to the first optical axis of the front lens group. The image-forming optical system is arranged to satisfy the following conditional expression: |Aim|/(90°−Ain)
摘要:
An electric device enabling the user to visually judge the section of present and amount of a substance absorbing or reflecting ultraviolet radiation. The electric device comprises an image detecting portion (6, 66, 127, 149) for receiving ultraviolet radiation and detecting an image from the received ultraviolet radiation and a display section (2, 32, 42, 52, 62, 82, 92, 102, 126, 147, 172) for displaying ultraviolet radiation information created from the image formed by the detected ultraviolet radiation by the image detecting portion.
摘要:
An electronic apparatus includes a power generator including a movable portion displaced by kinetic energy acting on an electronic apparatus body and a conversion portion converting displacement of the movable portion to electric energy, wherein the movable portion of the power generator is arranged on or below a gravity center of the electronic apparatus body in a state where the electronic apparatus body is supported in a used state.
摘要:
The present invention provides a wave plate capable of obtaining preferable phase conversion characteristic over a wide wavelength range. The wave plate includes an aluminum oxide film having linear grating groove patterns. The period L (μm) and the duty ratio De of the grating groove patterns are set at values within the first range specified by the following four formulas: L≦0.65 L≧2×10−14e31.263De L≦6.0317De2−10.352De+5.0516 (De−0.85)2/0.442+(L−0.41)2/0.392≦1
摘要翻译:本发明提供能够在宽波长范围内获得优选的相变特性的波片。 波片包括具有线性格栅凹槽图案的氧化铝膜。 光栅槽图案的周期L(母)和占空比De被设定在由以下四个公式指定的第一范围内的值:L <= 0.65 L> = 2×10 14 e <31.263> De L < = 6.0317De <2> -10.352De + 5.0516(De-0.85)2 /0.44 2 +(L-0.41)2 /0.39 2 <= 1
摘要:
An oxide magnetic material of the invention is an oxide magnetic material of a hexagonal ferrite containing Sr, has grain boundary phases in the surrounding of the crystal grains, contains not less than 2% by weight, preferably not less than 5% by weight, of Sr in the grain boundary phases and not less than 10% by weight, preferably not less than 25% by weight, of at least one additive element selected from Bi, V, B and Cu.