Mitutoyo Corporation

Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Jidosha Engineering Kabushiki Kaisha

Taizo Nakamura

Kenji Okabe

Yasushi Fukumoto

Fujio Hayakawa

Ikuo Saga

Karebu Kirihara

Masanobu Sato

Tatsuya Nagahama

Seiji Shimokawa

Atsushi Usami

Yuwu Zhang

Tatsuya Narumi

Yoshio Saruki

Jun Yoshida

Sukeyoshi Nakashima

Emi Kaneko

Shogo Iwaya

Hiroshi Watabe

A photoelectric encoder in which light emitted from a light source is modulated by an optical grating and the modulated light is detected by a light receiving element, includes a one-side telecentric optical system which forms an image of the light modulated by the optical grating. The imaging optical system has an aperture through which part of the light modulated by the optical grating is allowed to transmit, the aperture having a size which is required when a cutoff spatial frequency that is a spatial frequency indicating a resolution limit of the imaging optical system due to the light emitted from the light source has a value between a fundamental spatial frequency of the optical grating obtained by a Fourier transformation and a second harmonic of the fundamental spatial frequency.

Photoelectric encoder with optical grating

An in-vehicle speaker rotational mounting structure including a speaker unit having a claw portion provided thereon, and a panel member on which the speaker unit is mounted, wherein the claw portion is inserted into a slit formed in the panel member, so that the speaker unit is mounted on the panel member by being rotated in a circumferential direction. A jig inserting hole is provided in the speaker unit.

In-vehicle speaker rotational mounting structure

The present invention relates to a speaker for a vehicle and an installation structure therefor, and it is an object of the invention to enhance the speaker installation rigidity without impairing the acoustic characteristic of the speaker. The speaker installation structure comprises a speaker unit () for holding a speaker body () and having a plurality of claws () and a panel member () having an opening () and a plurality of slits (). For the installation of the speaker unit (), the plurality of claws () are inserted into the plurality of slits (), respectively, and the speaker unit () is rotated in its circumferential direction. The opening () is made to be smaller than the diameter of a speaker housing () and to have at least three linear portions (). Each of the slits () is formed outside the three linear portions () and inside an outer circumference of the speaker housing ().

Speaker for vehicle and mounting structure of the speaker

To provide a surface profile measurement apparatus capable of efficient measurement of the surface profile of an object. A diamond indenter ( ) is movably mounted. The tip end of the diamond indenter ( ) is irradiated by light, and the light reflected by the tip end ( ) is condensed through a lens ( ). The condensed light is observed by a photo sensor ( ) for measurement of the curvature radius of the tip end ( ). Meanwhile, the light reflected by the tip end ( ) and the light reflected by a reference body ( ) together cause an interference fringe. The interference fringe is observed by a CCD camera ( ) to measure the surface profile of tip end ( ).

Surface profile measurement apparatus

A focus detection unit being applicable to various workpiece and capable of reducing production cost and an optical measuring instrument having the focus detection unit are provided. The focus detection unit is for forming image of first focusing pattern and second focusing pattern onto an image surface of an optical system, projecting the image onto the workpiece, and adjusting relative position of the first focusing pattern and the second focusing pattern for focusing, the focus detection unit including: a slide plate having a plurality of pair of the first focusing pattern and the second focusing pattern; a switching member for switching the slide plate to project the image of either one of the first focusing patterns and the second pattern corresponding thereto onto the workpiece; and a projector for projecting the image of the focusing patterns switched by the switching member onto the workpiece.

Focus detection unit and optical measuring instrument having the same

A projection measuring instrument requiring no exchange work of overlay chart for comparatively observing a workpiece image and a template is provided. For the object, a table (56) for a workpiece (55) to be put on, an observation optical system having a screen (1) and a projection lens (53) for projecting an image of the workpiece (55) onto the screen (1), a relative movement unit (57) for relatively moving the table (56) and the observation optical system, and a displacement sensor (61) for detecting relative movement displacement by the relative movement unit (57) are provided, the screen (1) being a liquid crystal display, the liquid crystal display having a display controller (2) for displaying a line drawing for measuring a profile of the workpiece (55) onto the liquid crystal display at a predetermined magnification.

Projection measuring instrument

In order to reduce the possibility of moisture, which has seeped into a door from its lower side, contacting with a speaker and also of air pressure building up behind the speaker and hindering the movement of the diaphragm, a waterproof cover 3 is provided which includes a magnet cover 31 which follows the circumference of a magnet 16, a frame cover 32 which partially overlaps with the magnet cover 31 and follows the circumference of the frame 15 when it is combined with a speaker 2, a first aperture 33 placed between the magnet 16 and the magnet cover 31 and a second aperture 34 placed between the magnet cover 31 and the frame cover 32.

Speaker apparatus and waterproof cover therefor

A focus detection unit including an optical system employing an image sandwiching method is disclosed. In the focus detection unit, a double slit mask (12) forming double sight lines is disposed on the optical axis of a lamp 10 while a single slit mask (16) forming an single sight line is disposed on the optical axis of a lamp (14). A triangular pole prism 18 is provided, consisting of first and second side surfaces, which together constitutes an edge, and a plane opposing the edge. The prism (18) is disposed such that the double and single sight line are able to irradiate the first and second side surfaces. The prism reflects the incoming lines toward a plane before the right-angle edge. Before the edge of the prism (18), a projection lens (20) is provided for forming images of the double and single sight lines which have been reflected by the prism (18) and separated by a mask (22), at a both aiming line imaging position 100. The images are projected onto a workpiece.

Focus detection unit and microscope using the focus detection unit

A light beam from a light source is formed into an annular beam and an inner wall of a hole in an object is illuminated with the annular beam. The annular beam reflected from the inner wall of the hole is received as an annular image and a diameter of the annular image is measured, from which an inner diameter of the hole can be determined

Method and system for measuring an inner diameter of a hole formed in an

A tinsel cord support member 30 is formed on a gasket 24, two grooves for supporting tinsel cords 26 and conducting them from a tip end portion of the tinsel cord support member 30 up to near terminal lugs 28 are formed at predetermined intervals from each other in the tinsel cord support member, and a hollow portion 30a is provided between the two grooves formed in the tinsel cord support member 30.

Growing community of inventors

Tokyo, Japan

Taizo Nakamura