# US 2026/0093014 A1 · Ranging device

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- Number: US 2026/0093014 A1
- Document ID: US20260093014A1
- Status: Published application
- Kind: A1
- Application number: 19/410,467
- Filed: 2025-12-05
- Published: 2026-04-02
- Earliest claimed: 2023-06-30
- Assignees: Denso Corporation
- Applicants: Denso Corporation
- Inventors: Tsuyoshi IMAI; Keita OKADA; Shodai TOMITA
- Web page: https://patentgrep.com/patent/US20260093014A1

## CPC

- G01S 7/4817: {relating to scanning}
- G01C 3/06: Use of electric means to obtain final indication
- G01S 7/481: Constructional features, e.g. arrangements of optical elements
- G01S 7/4813: {Housing arrangements}
- G01S 17/931: of land vehicles
- G02B 26/10: Scanning systems
- G02B 26/105: {with one or more pivoting mirrors or galvano-mirrors (G02B26/101 takes precedence)}
- H02K 33/00: Motors with reciprocating, oscillating or vibrating magnet, armature or coil system (arrangements for handling mechanical energy structurally associated with motors H02K7/00, e.g. H02K7/06)
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01C: MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY (measuring liquid level G01F; radio navigation, determining distance or velocity by use of propagation effects, e.g. Doppler effects, propagation time, of radio waves, analogous arrangements using other waves G01S)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A ranging device is configured to measure a distance to an object by scanning an outside with light and detecting the light reflected from the object. The ranging device includes a mirror, an oscillating shaft, an actuator. The mirror is configured to oscillate to scan the outside with the light and fixed to the oscillating shaft. The actuator is configured to drive the oscillating shaft to oscillate by being energized. The actuator includes a rotor magnet and a rotor fixing portion. The oscillating shaft is inserted through the rotor magnet. The rotor fixing portion fixes the rotor magnet to the oscillating shaft. The rotor fixing portion restricts the rotor magnet from moving in an axial direction, a radial direction, and a rotational direction of the oscillating shaft. The rotor fixing portion includes a retaining plate and an elastic member. The oscillating shaft is rotatably supported by a bearing.

## Claims

### Claim 1

A ranging device configured to measure a distance to an object by scanning an outside with light and detecting the light reflected from the object, the ranging device comprising:
a mirror configured to oscillate to scan the outside with the light;
an oscillating shaft to which the mirror is fixed; and
an actuator configured to drive the oscillating shaft to oscillate by being energized, wherein
the actuator includes:
a rotor magnet having a tubular shape, the rotor magnet through which the oscillating shaft is inserted; and
a rotor fixing portion fixing the rotor magnet to the oscillating shaft,
the rotor fixing portion restricts the rotor magnet from moving in an axial direction, a radial direction, and a rotational direction of the oscillating shaft,
the rotor fixing portion includes:
a retaining plate disposed on one side of the rotor magnet in the axial direction and fixed to the oscillating shaft; and
an elastic member disposed on an other side of the rotor magnet in the axial direction,
the oscillating shaft is rotatably supported by a bearing,
the bearing, the elastic member, the rotor magnet, and the retaining plate are arranged in this order in the axial direction, and
the rotor magnet and the retaining plate are fixed together by an interposed member.

### Claim 2 (depends on 1)

The ranging device according to claim 1, wherein
the retaining plate has an adhesive surface that faces the rotor magnet, and a magnet contact portion that protrudes from the adhesive surface, and
the magnet contact portion is in contact with the rotor magnet without the interposed member,
the retaining plate defines a press-fit hole into which the oscillating shaft is press-fitted, and
the magnet contact portion is formed in an annular shape along an outer edge of the press-fit hole.

### Claim 3 (depends on 2)

The ranging device according to claim 2, wherein
the adhesive surface defines a groove that extends along an outer edge of the magnet contact portion.

### Claim 4 (depends on 3)

The ranging device according to claim 3, wherein
the adhesive surface has a flat portion radially outward of the groove, and
the flat portion is closer to the rotor magnet than the groove is, and is adhered to the rotor magnet by the interposed member.