Konica Minolta, Inc.

Minolta Company, Ltd.

Koji Takahara

Miyuki Teramoto

Yasumasa Sawai

Takuji Hatano

Koujirou Sekine

Yoshihiro Nakano

Kyu Takada

Shinji Maruyama

Naoki Nishida

Masahiro Terada

A method for manufacturing an optical lens using an ion-assisted deposition apparatus that comprises an ion source includes: forming, on a lens substrate made of a material containing 40 mass % or more of fluoride, a first lower layer of an anti-reflection film of the optical lens, wherein the first lower layer is a fluoride layer; forming, on the first lower layer, a second lower layer of the anti-reflection film; forming on the second lower layer, one or more intermediate layers of the antireflection film; forming, on the one or more intermediate layers, an uppermost layer of the anti-reflection film; and irradiating, using the ion source, the lens substrate with ions.

Method for manufacturing optical lens provided with anti-reflection film

An optical lens with an antireflective film includes: a lens substrate; and an antireflective film disposed on the lens substrate. The antireflective film is formed of layers each having a physical thickness of 140 nm or less. In order from an air side, the antireflective film has: a first layer formed as an MgFlayer, a second layer, a fourth layer, a sixth layer, an eighth layer, and a tenth layer each having a refractive index of 2.0 or more and 2.3 or less, and a third layer, a fifth layer, a seventh layer, and a ninth layer each formed as an SiOlayer.

Optical lens with antireflective film, projection lens, and projection lens optical system

A projection lens for projecting an image onto a projection plane includes: a lens substrate; and an antireflective film disposed on a surface of the lens substrate. The antireflective film includes, in order starting from an air side of the antireflective film, a first layer, second layer, third layer, fourth layer, fifth layer, sixth layer, seventh layer, and eighth layer. The first layer is formed of MgF. Each of the second layer, the fourth layer, the sixth layer, and the eighth layer has a refractive index of 2.0 to 2.3. Each of the third layer, the fifth layer, and the seventh layer is formed of SiO.

Projection lens

A projection lens included in a projector using laser beams as a light source is provided, the laser beams including as the light source, first blue laser light beams, second blue laser beams, first green laser beams, second green laser beams, first red laser beams, and second red laser beams, which are different in wavelength range. The projection lens has a relative maximum value of a transmittance on an optical axis between a wavelength not shorter than 645 nm and a wavelength not longer than 680 nm.

Projection lens and projector with laser beam light source

A color splitting/combining prism splits apart illumination light from a projector and combines together projection light from the projector. A part of the illumination light that is not used as the projection light passes through the color splitting/combining prism as OFF-light via an image display element in a direction different from the projection light. The color splitting/combining prism includes a dichroic film of which a cutoff wavelength, at which the dichroic film exhibits a transmittance of 50% when splitting two different colors between reflection and transmission, is provided in a wavelength range in which wavelength separation is possible for all of the illumination light, the projection light, and the OFF-light that are incident at different incidence angles respectively.

Color splitting/combining prism, and optical system and projector therewith

A prism unit that combines light in the three primary colors of R, G, and B on the same optical axis includes: a G-reflecting dichroic coating that reflects G light and passes R and B light; and an RB dichroic coating that reflects one of R and B, and passes the other one of R and B, the prism unit satisfying the following conditional expression: &#x3bb;rg&#x2267;&#x3bb;rb&#x2267;0.67&#xd7;&#x3bb;rg+0.33&#xd7;&#x3bb;gb, where &#x3bb;gb represents the wavelength at which the transmittance is 50% when the colors of G and B on the composite optical axis are combined, &#x3bb;rg represents the wavelength at which the transmittance is 50% when the colors of R and G on the composite optical axis are combined, and &#x3bb;rb represents the wavelength at which the transmittance is 50% when the colors of R and B on the composite optical axis are combined.

Prism unit and projector

Provided are a color separating and combining prism and an optical system using the same for a projector. A color separating and combining prism (DP) includes dichroic films (B, R) that reflect the light of the wavelength range of either a first or third range from among the first wavelength range of a blue region, a second wavelength range of a green region, and a third wavelength range of a red region, and pass the light of the remaining two adjacent wavelength ranges, and at a specific angle of incidence, the average reflectance in the two wavelength ranges which the films pass is lower than the wavelength average reflectance of the wavelength region sandwiched by the two wavelength ranges.

Color separating and combining prism and projector using same

A prism for a projection optical system included in a projector including an illumination light source, an illumination optical system, and a projection optical system, includes: a first surface that totally reflects a beam of one of the illumination light and the projection light and transmits a beam of the other; and a second surface that is opposed to the first surface with an air gap therebetween and transmits a beam passing through the first surface, wherein the first surface has an antireflective film having an average reflectivity of a s-polarized reflectivity and a p-polarized reflectivity at a center angle of a transmitted beam of 2% or lower in three wavelength ranges including a first wavelength range of blue, a second wavelength range of green, and a third wavelength range of red.

Prism for projection optical system and optical system having same

A polarization conversion optical system converts light having a nonuniform plane of polarization into light having a uniform plane of polarization. The system includes a multilayer dielectric film at the side upon which the target light is incident. The film exhibits the property that it reflects one polarized component of the light and transmits a second polarized component of the light at a first angle of incidence, but transmits the first component at a second angle of incidence. Incident target light that is transmitted through the film at the first angle of incidence passes through a quarter-wavelength plate and is reflected at the second angle, whereupon it is retransmitted through the quarter-wavelength plate to be converted from one plane of polarization to the other. It is then emitted from the dielectric film in the same plane of polarization as light reflected by the film.

Polarization conversion optical system and polarization conversion element

A diffractive optical element has a diffraction grating formed by periodic depressions and projections on the surface of a substrate and a dielectric multilayer film on the diffraction grating. The materials of the respective layers of the film are chosen such that the depth of the depressions is an integral multiple of the sum of the thickness of the layers in one period of the film. As a result, individual layers of the film are continuous across multiple depressions and projections, to provide improved first-order reflectance.

Diffractive optical element

Disclosed herein is an optical switch for changing over a running direction of a light passing through an optical waveguide between a first direction and a second direction by moving a switching member disposed on an optical path of an optical waveguide. The switching member has a plurality of switching positions for selectively guiding each of lights of at least two different wavelengths into the first direction or second direction.

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Hirakata, Japan

Koji Takahara