摘要:
An illumination optical system that illuminates a plurality of image display elements comprises; a color separating optical system that separates light emitted from a light source into a plurality of color light components; and a plurality of light-guiding optical systems, each of which guides light component to a corresponding one of the plurality of image display elements. An illumination area on the image display element that is illuminated by at least one of the plurality of light-guiding optical systems is larger than those on the image display elements illuminated by the other ones of the plurality of light-guiding optical systems. This provides a compact projection type image display apparatus which can project bright images.
摘要:
In a projection type image display apparatus, when the angle of light incident on the multi-layer film of a polarizing beam splitter for synthesizing an optical path becomes uneven, the loss of the light occurs. So, the projection type image display apparatus of the present invention is provided with an illuminating optical system 1-5b, a color separating and synthesizing optical system 7 for separating illuminating light from the illuminating optical system into a plurality of color lights and making the respective color lights enter image display elements 8r-8b provided for the respective color lights, and synthesizing a plurality of image lights emerging from these image display elements, a projection optical system 10 for projecting and displaying the image lights synthesized by the color separating and synthesizing optical system, and polarizing elements Pr, Pg, Pb for transmitting only a particular polarized component light therethrough disposed between the color separating and synthesizing optical system and the image display elements.
摘要:
An illumination optical system that illuminates a plurality of image display elements comprises; a color separating optical system that separates light emitted from a light source into a plurality of color light components; and a plurality of light-guiding optical systems, each of which guides light component to a corresponding one of the plurality of image display elements. An illumination area on the image display element that is illuminated by at least one of the plurality of light-guiding optical systems is larger than those on the image display elements illuminated by the other ones of the plurality of light-guiding optical systems. This provides a compact projection type image display apparatus which can project bright images.
摘要:
There are disclosed a coated cutting tool which comprises a base material of a hard alloy comprising a hard phase of tungsten carbide and at least one material selected from a carbide, nitride and carbonitride of a metal selected from the Group 4, 5 and 6 of the Periodic Table and a mutual solid solution thereof and a binder phase of at least one element selected from Fe, Ni and Co, and a hard coating film formed on the surface of the base material by a CVD method, wherein the hard coating film has a columnar crystal layer comprising at least one material selected from a carbide, nitride and carbonitride of titanium, the columnar crystal layer contains large-sized particles and small-sized particles, and the ratio of the amounts of the large particles to the small particles is 3 to 50; and a method for producing the same which comprises forming the hard coating film by at least one coating film of a carbide, carbonitride and carbonitroxide of titanium using a hydrocarbon gas containing ethane as a carbon element-feeding gas.
摘要:
An eyepiece lens is constructed with, in order from an entrance side for light to an exit side for light, first, second, third, fourth and fifth lens units of negative, positive, positive, positive and positive refractive powers, respectively. Each of the first, second, third, fourth and fifth lens units of the eyepiece lens is composed only of one lens or a cemented lens, and an intermediate image by an objective lens is formed between the second lens unit and the third lens unit. An objective lens is constructed with, in order from an object side to an image side, first and second lens units of positive and negative refractive powers, respectively. The first and second lens units of the objective lens are composed of one positive lens and of one positive lens and one negative lens, respectively, and the various conditions are appropriately set. An optical apparatus includes the eyepiece lens, the objective lens and an erecting prism.
摘要:
An image display apparatus includes: a color separation optical system having a color separation optical member for reflecting a color light component in a specific wavelength range of the converging light and transmitting color light components in the other wavelength ranges. An optical axis of light incident on the color separation optical member forms an angle smaller than 45 degrees with a normal to a light incident surface of the color separation optical member.
摘要:
There are disclosed a coated cutting tool which comprises a base material of a hard alloy comprising a hard phase of tungsten carbide and at least one material selected from a carbide, nitride and carbonitride of a metal selected from the Group 4, 5 and 6 of the Periodic Table and a mutual solid solution thereof and a binder phase of at least one element selected from Fe, Ni and Co, and a hard coating film formed on the surface of the base material by a CVD method, wherein the hard coating film has a columnar crystal layer comprising at least one material selected from a carbide, nitride and carbonitride of titanium, the columnar crystal layer contains large-sized particles and small-sized particles, and the ratio of the amounts of the large particles to the small particles is 3 to 50; and a method for producing the same which comprises forming the hard coating film by at least one coating film of a carbide, carbonitride and carbonitroxide of titanium using a hydrocarbon gas containing ethane as a carbon element-feeding gas.
摘要:
Fluorophosphate optical glass has the following composition in percent by weight:(a) By metaphosphate raw material conversion:______________________________________ Al(PO.sub.3).sub.3 13.0-39.0 Mg(PO.sub.3).sub.2 0-24.0 Ca(PO.sub.3).sub.2 1.0-20.0 Ba(PO.sub.3).sub.2 5.0-19.0 ______________________________________ (The total amount of metaphosphate raw materials is 31-49 percent by weight.)(b) By fluoride raw material conversion:______________________________________ MgF.sub.2 2.0-13.0 SrF.sub.2 0-20.0 BaF.sub.2 1.0-33.0 AlF.sub.3 0-8.0 YF.sub.3 0-8.0 ______________________________________ (The total amount of fluoride raw materials is 19-47 percent by weight.)(c) By oxide raw material conversion:______________________________________ BaO 10.0-36.0 Y.sub.2 O.sub.3 and/or Yb.sub.2 O.sub.3 1.5-12.0 ZnO 0-6.0 PbO 0-29.0 Nb.sub.2 O.sub.5 0-22.0 ______________________________________ (The total amount of oxide raw materials is 20-42 percent by weight.)
摘要:
Disclosed herein is a biofeedback device which separately extracts the .alpha. wave component and the muscle component included in the brain wave and, therefore, permits the user thereof through auditory perception of associated audio frequency sounds to recognize accurately the appearance in the brain wave of the .alpha. wave component or muscle component on the basis of the principle that exclusive perception of the sound associated with the .alpha. wave component indicates relaxation of the subject's mental state, exclusive perception of the sounds associated with the muscle component indicates tension of the subject's mental state or cephalic state and simultaneous perception of the sounds associated with both components indicates occurrence of a phenomenon having nothing to do with the responses for feedback training.
摘要:
An illumination optical system includes a first compression system configured to compress a light flux on each of first and second sections, a second compression system configured to compress the light flux on the first section, a polarization converter arranged so that a section that contains a normal of the second polarization splitting surface and the optical axis becomes the second section, and configured to convert non-polarized light into linearly polarized light, a first lens array arranged in front of the polarization converter along an optical path, and a second lens array arranged between the first lens array and the polarization converter along the optical path. Both of the first lens array and the second lens array have no optical power on the second section.