Murakami Corporation

Ayako Yamada

Hidenori Sato

Hiromi Iwasaki

Masahiro Motomiya

Mitsuyoshi Nagao

Noriyuki Takemasa

Akiyoshi Kobayashi

Mituyoshi Nagao

Norihiro Suzuki

To provide a vehicle monitor apparatus capable of acquiring more information through effective utilization of an image taking region of a camera on the occasion of taking interior and exterior images of a vehicle with the camera. A vehicle monitor apparatusis provided with a drive recorderand a reflecting mirrorThe drive recorderis provided with a cameraand the camerais arranged to take a forward image of the vehicle. In an image taking region of the camerathe reflecting mirroris located in a range where a hoodshould be imaged if the reflecting mirrorwere excluded, and the cameratakes an image of an exterior situation outside the vehicle viewed through a windshield, and an image projected by the reflecting mirror

Vehicle monitor apparatus

An electric mirror control device is provided which can prevent generation of a clutch noise by stopping slipping of a clutch provided at an actuator as quickly as possible while preventing narrowing of an allowable range of a tilting angle of a mirror surface. In controlling an electric mirror, a control device clamps a voltage value of a voltage applied to a motor detected by a mirror surface angle detection circuit to a predetermined upper limit value and a predetermined lower limit value at a clamp circuit. Stop control of the motor is performed based on the voltage value clamped to the upper limit value and the lower limit value in this way.

Electric mirror control device

A liquid crystal glare-proof mirror is capable of displaying a picture in which a non-glare-proof mode and a glare-proof mode is switched, including a first polarizing plate for selecting a polarization component to be transmitted; a liquid crystal cell disposed at a back of the first polarizing plate, the liquid crystal cell having two control areas, each of which is controlled independently; a second polarizing plate disposed at a back of the liquid crystal cell, the second polarizing plate transmitting either one of two orthogonal polarization components of light and reflecting the other one of the polarization components; and an image generating apparatus disposed at a part of a back of the second polarizing plate, the part corresponding to either one of the two control areas, the image generating apparatus ejecting picture light having a polarization component which is transmitted through the second polarizing plate.

Liquid crystal glare-proof mirror

Disclosed are a mirror and an angle detection device that detects an inclined angle of a mirror surface of the mirror. A mirror includes a mirror surface, an actuator for swiveling the mirror surface, at least one magnet for changing its orientation by an angle according to a variation in an inclined angle of the mirror surface, and at least one signal output unit for outputting a signal according to the inclined angle, based on the orientation of the magnet. An angle detection device that detects an inclined angle of a mirror surface of a mirror includes at least one magnet for changing its orientation by an angle according to a variation in the inclined angle of the mirror surface, and at least one signal output unit for outputting a signal according to the inclined angle, based on the orientation of the magnet.

Mirror and angle detection device

To provide a position detection apparatus with an expanded range of good linearity in a magnetic sensor's output characteristic with respect to position of a movable body as well as to provide a vehicle mirror angle detection apparatus using the position detection apparatus. Two permanent magnetsandand one Hall-effect sensorare used. The permanent magnetsandare arranged with their relative position fixed. The Hall-effect sensoris placed laterally to the arrangement of the two permanent magnetsand. The permanent magnetsandand Hall-effect sensormove relative to each other in a direction parallel to the arranging direction of the permanent magnetsand. Those surfacesandof the permanent magnetsandwhich face the Hall-effect sensorconstitute magnetic pole faces of opposite polarity and the magnetic pole facesandare placed with an inward tilt. A magnetic sensing direction F of the Hall-effect sensoris set orthogonally to the arranging direction of the permanent magnetsand

Position detection apparatus and vehicle mirror angle detection apparatus

A vehicle mirror comprises: a mirror surface; an actuatorwhich tilts the mirror surface; a plate pivot, which changes its direction together with the mirror surface; a spring, which applies a resilient force to the plate pivotin the direction substantially vertical to the mirror surface; a guide springwhich is fitted to the end of the springat the side far from the interlocking member; a semiconductor pressure sensor, which is in contact with the guide spring at substantially one point so as to detect a load loaded on the one point from the pressing member; and a signal outputting portion which outputs a signal depending upon the tilted angle of the mirror surface based on the force detected by the semiconductor pressure sensor

The present invention provides a DC brush motor rotation amount detection method comprising the steps of: counting pulses generated by switching of brushes when a DC brush motor rotates; removing any noise pulse generated during a pulse rejection period which is shorter than a pulse interval and which is started when each pulse is generated; counting pulses generated during pulse acceptance periods outside the pulse rejection periods; and detecting a rotation amount of the DC brush motor, wherein the pulse rejection period during steady-state operation of the DC brush motor is ended when a predetermined time elapses from a start point of the pulse rejection period, where the predetermined time is calculated by multiplying a pulse interval of a corresponding pulse zone one rotation before a pulse zone to which the pulse rejection period belongs by a coefficient K(&#xbd;&#x3c;K&#x3c;1).

DC brush motor rotation amount detection method and apparatus

A mirror () having a specular surface changeable in orientation using an actuator () is provided with an angle detection capability at reduced cost. A plate pivot () can change its orientation together with the specular surface so as to orient in a direction in which the specular surface is orienting. A slide block () is stressed toward the plate pivot () so that rotation of the plate pivot () causes the slide block () to move in a direction substantially perpendicular to the specular surface by an amount proportional to an amount of the rotation of the plate pivot (). A magnet () moves in the direction of movement of the slide block () by an amount proportional to an amount of the movement of the slide block (), and a magnetism sensing element () detects magnetism derived from the magnet () and outputs a signal corresponding to the amount of movement of the magnet ().

Mirror and angle detection apparatus

A vehicle mirror comprises a mirror surface; a plate pivotwhich tilts the mirror surface by tilting the plate pivot itself,

As a vertical motion motor (M) comprised of a brushless motor is driven to rotate in response to a control signal from a main controller (), a pulse signal generated with the shape corresponding to the number of rotations of the vertical motion motor (M) is counted by a pulse signal count unit of the main controller (). Feedback control is exercised over the number of rotations of the vertical motion motor (M) in accordance with a count value (the number of counts) of the pulse signal, so that mirror surface orientation of a door mirror () can be accurately adjusted to tilt downward to a predetermined set angle, and to tilt upward back to a home position angle. A mirror angle control apparatus () is provided with high durability and reliability, which can exercise accurate control for a long period of time.

Mirror angle control apparatus for vehicular electric mirror assembly

When a signal level of a motor brush switching signal is low and thus dropouts or omission of the pulse signals converted by a waveform shaping part take place, so that an interval between a pulse signal to be currently counted and an immediately preceding pulse signal thereof becomes longer than a predetermined average interval, a pulse signal counter makes a correction of the number of counts by adding one pulse to the pulse to be counted. Therefore, even if the signal level of the motor brush switching signals generated from a vertical motion motor Mis low for some reasons, accurate control can be exercised over the number of rotations of the vertical motion motor M

Motor control device for vehicular power mirror

In response to an operation of reversing a vehicle, a tilt motor is rotated by a specific amount in a normal direction to tilt a mirror angle to a position that permits a mirror to provide the driver with a view of the area near a rear wheel of the vehicle, while in response to an operation of releasing the reverse gear, the tilt motor is rotated by a specific amount in a reverse direction to restore the tilt angle to a normal position thereof. During the operations, a high-frequency signal generated upon switching a brush of the motor is detected using a pickup coil to determine an amount of rotation of the motor. One and the same pickup coil may be used for detection during both of normal and reverse rotations. A voltage of a batteryis stabilized in a motor power stabilizing circuit, and supplied via a motor driving circuitto a tilt motor M. Polarity of the voltage outputted from the motor power stabilizing circuitis fixed. Polarity of the voltage outputted from the motor driving circuitis switchable according to a switching operation of the motor driving circuitbased upon a driving direction instruction. The pickup coil Lis provided between the motor power stabilizing circuitand the motor driving circuit

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Fujieda, Japan

Ayako Yamada