# US 12,601,837 B2 · Distance measurement device

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- Number: US 12,601,837 B2
- Document ID: US12601837B2
- Status: Granted
- Kind: B2
- Application number: 18/526,196
- Filed: 2023-12-01
- Published: 2024-03-28
- Granted: 2026-04-14
- Earliest claimed: 2021-06-02
- Assignees: FUJIFILM Corporation
- Applicants: FUJIFILM Corporation
- Inventors: Yujiro Yanai; Keisuke Kodama
- Web page: https://patentgrep.com/patent/US12601837B2

## CPC

- G01S 17/08: for measuring distance only (indirect measurement G01S17/46; active triangulation systems G01S17/48)
- G01S 17/931: of land vehicles
- G01S 7/4814: {of transmitters alone}
- G01S 7/4816: {of receivers alone}
- G01S 17/42: Simultaneous measurement of distance and other co-ordinates (indirect measurement G01S17/46)
- 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

## Abstract

An object is to provide a distance measurement device capable of receiving measurement light reflected by an object by responding to a wide angle range with a high S/N ratio. The object is achieved by the distance measurement device including: an infrared light source; a light receiving section that receives an infrared ray emitted from the light source and reflected by an object; and a band-pass filter (BPF) member that is disposed on a light-receiving surface side of the light receiving section and through which the infrared ray is transmitted, in which the BPF member includes a BPF and a refraction member that is disposed in contact with the BPF and refracts the infrared ray.

## Claims

### Claim 1

A distance measurement device comprising:
a light source that emits an infrared ray;
a light receiving section that receives the infrared ray emitted from the light source and reflected by an object; and
a band-pass filter member that is disposed on a light-receiving surface side of the light receiving section and through which the infrared ray is transmitted,
wherein the band-pass filter member includes a band-pass filter, and a refraction member that is disposed in contact with the band-pass filter and refracts the infrared ray, and
the refraction member is any one of a microlens array in which an angle formed by a normal line of the band-pass filter and a normal line of a curved surface of a microlens is 30° or less in all regions of the microlens, a lenticular lens in which an angle formed by a normal line of the band-pass filter and a normal line of a curved surface of a cylindrical lens is 30° or less in all regions of the cylindrical lens, or a prism sheet in which an inclined angle of a prism with respect to a surface of the band-pass filter is 30° or less.

### Claim 2 (depends on 1)

The distance measurement device according to claim 1,
wherein, in the band-pass filter member, the band-pass filter and the refraction member are provided in this order from a light receiving section side.

### Claim 3 (depends on 1)

The distance measurement device according to claim 1, further comprising:
a condenser lens on a light incident side of the band-pass filter member.

### Claim 4 (depends on 1)

The distance measurement device according to claim 1,
wherein, in a case in which a temperature dependence of a wavelength of emitted light from the light source is x [nm/° C.] and a temperature dependence of a transmission central wavelength of the band-pass filter is y [nm/° C.], x−0.05≤y≤x+0.05 is satisfied.

### Claim 5 (depends on 1)

The distance measurement device according to claim 1,
wherein the band-pass filter is formed of a cholesteric liquid crystal layer in which a cholesteric liquid crystalline phase is immobilized, and
a refractive index of the band-pass filter is 1.5 to 1.7.

### Claim 6 (depends on 1)

The distance measurement device according to claim 1,
wherein the refraction member is any one of the lenticular lens, or the prism sheet.