Canon Kabushiki Kaisha

Honda Giken Kogyo Kabushiki Kaisha

Rheon Automatic Machinery Co., Ltd.

Mikio Kobayashi

Tsukashi Ohama

Minoru Kageyama

Tomonori Nakamura

Satoshi Ito

Reona Ushigome

Sadao Ueno

Yoshihisa Doi

Yuichi Nagao

Yoshio Tomioka

Kengo Takano

Takamasa Tsuchida

Toshio Soma

Masahiro Yonemaru

Tsunehiko Yoshida

Junya Saeki, Deceased

Tamotsu Kaneko

An optical system includes first to third units. The first unit includes a first substrate and a first lens having negative refractive power. The first lens is disposed on the image side of the first substrate. The second unit includes a second substrate and a second lens having positive refractive power. The second lens is disposed on the object side or image side of the second substrate. The third unit includes a third substrate and a third lens having positive refractive power. The third lens is disposed on the object side or image side of the third substrate. At least one of the first to third lenses constitutes a cemented lens including a fourth lens. The fourth lens and the lens cemented with the fourth lens in the cemented lens have refractive powers different from each other and Abbe numbers different from each other.

Optical system and image pickup apparatus

An optical system includes, in order from an object side to an image side, a first unit, a second unit, and a third unit. The first unit includes a first substrate, and a first lens having a negative refractive power and disposed on the image side of the first substrate. The second unit includes a second substrate, and a second lens having a positive refractive power and disposed on the object side of the second substrate. The third unit includes a third substrate, and a third lens having a positive refractive power and disposed on the object side of the third substrate.

An optical system includes, in order from an object side to an image side, a first unit and a second unit. The first unit includes a first substrate, and a first lens having a negative refractive power and disposed on the image side of the first substrate. The second unit includes a second substrate, and a second lens having a positive refractive power and disposed on the image side of the second substrate. An absolute value of the refractive power on an optical axis of the second lens is larger than that of the first lens. A surface on the image side of the first lens is an aspheric surface. In the aspheric surface of the first lens, a refractive power at an outermost peripheral portion of an effective area is smaller than a refractive power on the optical axis.

A diffractive optical element includes a first lens having a convex surface, a second lens having a concave surface, disposed in such a manner that the concave surface of the second lens faces the convex surface of the first lens, and a diffraction grating section formed between the first and the second lenses and having positive optical power through diffraction. The diffraction grating section includes a first diffraction grating and a second diffraction grating disposed in this order from a side closer to the first lens; the second diffraction grating has a refractive index larger than that of the first diffraction grating, and an inner diameter of a grating wall surface of the diffraction grating section decreases as approaching to the second lens from the first lens.

Diffractive optical element, optical system having the same, and imaging apparatus

A diffraction optical element includes a first diffraction grating having a first grating surface and a first grating wall surface, a second diffraction grating having a second grating surface and a second grating wall surface, and a thin film configured to contact the first grating wall surface and the second grating wall surface. The predetermined conditions are satisfied.

Diffraction optical element, optical system, and imaging apparatus

A diffractive optical elementincludes a first diffraction grating, a second diffraction grating, filmsformed between the first diffraction gratingand the second diffraction grating. The DOEsatisfies a conditional expression of n&#x3c;n&#x3c;n, where nis an average refractive index of filmsformed between grating wall surfacesand grating wall surfacesat a wavelength of 550 nm, nis a refractive index of the first diffraction gratingat a wavelength of 550 nm, and nis a refractive index of the second diffraction gratingat a wavelength of 550 nm. The filmsand filmsthat are formed between grating surfacesand grating surfacessatisfy a predetermined relationship.

Diffractive optical element, optical system including diffractive optical element, imaging apparatus, and lens device

A diffractive optical element includes multiple diffraction gratings laminated and made of at least three material types, wherein the multiple diffraction gratings include: a first combination part including two diffraction gratings of materials different from each other in which grating side surfaces of grating parts contact with each other or are disposed close to each other in a grating pitch direction; and a second combination part including two diffraction gratings of materials different from each other in which at least one material is different from the materials of the first combination part; and when N1Aw and N1Bw denote refractive indices of the first combination part at a wavelength (w), &#x3bd;1A and &#x3bd;1B denote Abbe numbers, N2Ad and N2Bd denote refractive indices of the second combination part on a d-line, &#x3bd;2A and &#x3bd;2B denote Abbe numbers, the wavelength (w) is 370&#x3c;w&#x3c;730 (nm). The followings are satisfied:11=0;16&#x3c;(&#x3bd;1&#x2212;&#x3bd;1)&#x3c;75;0.03&#x3c;|22|&#x3c;0.5; and16&#x3c;(&#x3bd;2&#x2212;&#x3bd;2)&#x3c;75.

Diffractive optical element, optical system including the same, and image pickup apparatus

A diffractive optical element includes at least one element portion including a base, a diffraction grating, a substrate, and an intermediate layer. The base and the diffraction grating are disposed above the substrate through the intermediate layer, and are formed of a same material. An extinction coefficient for the d-line of the material of the diffraction grating and an extinction coefficient for the d-line of a material of the intermediate layer are properly set to satisfied conditional expressions.

Diffractive optical element and optical system including the same

At least one exemplary embodiment is directed to an optical system which includes a plurality of refractive optical elements arranged substantially symmetrically with respect to an aperture-stop. Furthermore the optical system comprises a refractive optical element being constituted by a solid material. An Abbe number &#x3bd;d of the solid material and a partial dispersion ratio &#x3b8;gF of the solid material can satisfy the following conditions:&#x3b8;&#x2212;(&#x2212;1.665&#xd7;10+5.213&#xd7;10&#x2212;5.656&#xd7;10+0.755)&#x3e;0,&#x3b8;&#x2212;(&#x2212;1.665&#xd7;10+5.213&#xd7;10&#x2212;5.656&#xd7;10+1.011)&#x3c;0.

Optical system and optical apparatus having the same

A process for preparing dough pieces is provided. In the process, fermented dough receives repeated pressure for stretching, which pressure is given by a pressing device. However, through this process, the network structure of gel is not broken. Thus, a further fermentation step, such as an intermediate fermentation step or a final fermentation step, can be eliminated.

Process for preparing dough pieces

A cleaning apparatus for a magnet filter and a method of cleaning a magnetic filter. The magnetic filter is disposed in a circular passage for processing a cleaning fluid. The cleaning apparatus includes sensors for determining when the magnetic filter should be cleaned, which prevents a loss of effectiveness of the cleaning fluid due to detached metal powder falling off of the filter.

Cleaning apparatus for a magnetic filter and cleaning method thereof

A forge-molding method for forming a constant velocity joint outer ring comprising a shaft and a cup formed integral with and expanding radially and outwardly from one end of the shaft is provided. The method uses an ironing die apparatus which is provided with a lower molding die, an upper molding die and an ironing punch. The lower molding die is provided with a first cavity formed to have a final degree of product accuracy with respect to the shaft and adapted to apply a final ironing process to the shaft, while the upper molding die is provided with a second cavity for restraining the outer peripheral surface of the cup. Consequently, the accuracy of concentricity between the shaft and the cup can be securely maintained in a simple manner and a sufficient degree of accuracy of the inner peripheral surface and/or the inner diameter of the cup can be effectively secured.

Method of forming outer ring of constant velocity joint

A plurality of grooves, which are defined in a reinforcing ring, comprise respective end walls which are formed as inclined surfaces. The grooves further comprise walls on which engaging projections are disposed in parallel to the inclined surfaces respectively. Segmented dies are installed in the grooves. Grooves, which are defined on the segmented dies, slidably engage with the engaging projections respectively. Accordingly, the segmented dies are displaced along the inclined surfaces while being guided by the engaging projections. Thus, it is possible to stably hold the segmented dies on the reinforcing ring. Further, it is possible to simplify the structure of the forging apparatus, and it is possible to decrease the number of parts.

Forging apparatus for inner race of constant velocity universal joint

A coating line system has a main coating line including at least a main coating booth for coating a workpiece, and a coating repairing line branched from the main coating line downstream of an inspecting section for inspecting the coated workpiece for a coating defect thereof. The coating repairing line has a coating repairing booth for repairing a coating defect of the workpiece which is caused in the main coating line, and a drying furnace disposed downstream of the coating repairing booth along the coating repairing line, for drying the workpiece which has been repaired in the coating repairing booth.

Coating line system and method of repairing coating defect

The present invention provides an apparatus to stably and continuously roll up bread dough into stick-like bread, such as bread dough or bread dough on which ham or cheese is put. The apparatus includes a drive shaft located parallel to a conveying surface of a conveyor and a plurality of circular dough-holding disks mounted on the drive shaft. A plurality of dough-rolling plates is provided between the adjacent dough-holding disks along the conveying surface. The rolling plates roll the bread dough and the like. The apparatus securely rolls bread dough of a nonuniform thickness or bread dough on which ham and the like is put. Also, the present invention can securely roll a plurality of rows of bread dough that is conveyed.

Growing community of inventors

Utsunomiya, Japan

Mikio Kobayashi