# US 10,481,394 B2 · Head up display apparatus

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,481,394 B2
- Document ID: US10481394B2
- Status: Granted
- Kind: B2
- Application number: 15/385,182
- Filed: 2016-12-20
- Published: 2017-07-13
- Granted: 2019-11-19
- Earliest claimed: 2016-01-12
- Assignees: FUJIFILM Corporation
- Applicants: FUJIFILM Corporation
- Inventors: Masanao Kawana
- Web page: https://patentgrep.com/patent/US10481394B2

## CPC

- G02B 27/0101: {characterised by optical features (G02B27/0172 takes precedence)}
- B60K 35/213: {Virtual instruments}
- B60K 35/23: Head-up displays [HUD] (optical aspects of head-up displays G02B27/01)
- B60K 35/28: characterised by the type of the output information, e.g. video entertainment or vehicle dynamics information; characterised by the purpose of the output information, e.g. for attracting the attention of the driver
- B60K 35/29: Instruments characterised by the way in which information is handled, e.g. showing information on plural displays or prioritising information according to driving conditions
- B60K 35/425: {Anti-reflection arrangements}
- G06T 19/006: {Mixed reality (object pose determination, tracking or camera calibration for mixed reality G06T7/00)}
- B60K 2360/23: using reflectors
- B60K 2360/25: using filters
- B60K 2360/31: Virtual images
- B60K 2360/333: Lasers
- B60K 2360/334: Projection means
- G02B 2027/0112: {comprising device for genereting colour display}
- G02B 2027/0114: {comprising dichroic elements}
- G02B 2027/0127: {comprising devices increasing the depth of field}
- G02B 2027/0141: {characterised by the informative content of the display}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL

## Abstract

An optical filter having spectral properties that reflects light of a first wavelength band and transmits light of a second wavelength band that does not include the first wavelength band is provided between a greater distance optical system that displays a virtual image at a greater distance from an image reflection surface and a closer distance optical system that displays a virtual image at a closer distance from the image reflection surface. The optical filter aligns the optical paths of display light of the greater distance optical system and the closer distance optical system and guides the display light to the image reflection surface. Further, the powers of the greater distance optical system and the closer distance optical system are set to be different.

## Claims

### Claim 1

A head up display apparatus, comprising:
an image reflection surface that faces an observer and reflects display light toward the observer;
a first image display element that outputs display light onto the image reflection surface;
a second image display element that outputs display light onto the image reflection surface;
images displayed by the first image display and the second display element being magnified and displayed beyond the image reflection surface as virtual images;
the head up display apparatus further comprising:
a greater distance optical system that displays a virtual image of the image displayed by the first image display element at a greater distance from the image reflection surface;
a closer distance optical system having a power different from that of the greater distance optical system that displays a virtual image of the image displayed by the second image display element at a closer distance from the image reflection surface; and
an optical filter having spectral properties that reflects light of a first wavelength band and transmits light of a second wavelength band that does not include the first wavelength band,
the greater distance optical system and the closer distance optical system being arranged to have the optical filter interposed therebetween,
the spectral properties being those in which wavelength bands for each of R (red), G (green), and B (blue) are divided into a plurality of sub wavelength bands,
a wavelength band constituted by a combination of portions of each of the R, G and B sub wavelength bands is designated as a first RGB band,
a wavelength band constituted by a combination of portions of sub wavelength bands different from the first RGB band is designated as a second RGB band, and
one of the first RGB band and the second RGB band is reflected and the other is transmitted by the optical filter.

### Claim 2 (depends on 1)

The head up display apparatus as defined in claim 1, wherein:
the optical filter is a light transmissive plane parallel plate shaped substrate having a filter layer having said spectral properties formed on at least one surface thereof.

### Claim 3 (depends on 1)

The head up display apparatus as defined in claim 1, wherein:
the optical filter is a light transmissive substrate having a filter layer having said spectral properties formed on one surface thereof; and
the filter layer faces an optical system, which is either the greater distance optical system or the closer distance optical system, for which display light is reflected.

### Claim 4 (depends on 1)

The head up display apparatus as defined in claim 1, wherein:
the display light output from the greater distance optical system passes through the optical filter and the display light output from the closer distance optical system is reflected by the optical filter.

### Claim 5 (depends on 1)

The head up display apparatus as defined in claim 1, wherein:
the display light output from the greater distance optical system is reflected by the optical filter and the display light output from the closer distance optical system passes through the optical filter.

### Claim 6 (depends on 1)

The head up display apparatus as defined in claim 1, wherein:
the first RGB band includes sub wavelength bands most toward the short wavelength side within each of the R, G and B wavelength bands;
the first RGB band is assigned to the optical path of the display light which is output from the greater distance optical system; and
the second RGB band is assigned to the optical path of the display light which is output from the closer distance optical system.

### Claim 7 (depends on 1)

The head up display apparatus as defined in claim 1, wherein:
a light source of the first image display element and/or a light source of the second image display element is constituted by a light emitting diode.

### Claim 8 (depends on 1)

The head up display apparatus as defined in claim 1, wherein:
a light source of the first image display element and/or a light source of the second image display element is constituted by a laser.

### Claim 9 (depends on 1)

The head up display apparatus as defined in claim 1, wherein:
a light source of the first image display element and/or a light source of the second image display element is constituted by a combination of a light emitting diode and a laser.