# US 10,120,272 B1 · Fluorescent color wheel and projector

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- Number: US 10,120,272 B1
- Document ID: US10120272B1
- Status: Granted
- Kind: B1
- Application number: 15/693,497
- Filed: 2017-09-01
- Published: 2018-11-08
- Granted: 2018-11-06
- Earliest claimed: 2017-05-03
- Assignees: Delta Electronics, Inc.
- Applicants: Delta Electronics, Inc.
- Inventors: Keh-Su Chang; Yen-I Chou; Chi Chen
- Web page: https://patentgrep.com/patent/US10120272B1

## CPC

- G03B 21/204: {using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197)}
- G03B 21/16: Cooling; Preventing overheating
- G03B 21/28: Reflectors in projection beam {(in illumination beam G03B21/2066)}
- G03B 33/08: Sequential recording or projection (G03B33/02, G03B33/04, G03B33/06 take precedence)
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)

## Abstract

A fluorescent color wheel includes a substrate, a working fluid, and a fluorescent powder layer. The substrate has at least one flow channel therein. The flow channel has a first end and a second end respectively adjacent to a central region and a peripheral region of the substrate. The working fluid flows in the flow channel in a gas-liquid coexistence state. The fluorescent powder layer is disposed on the substrate and located at the peripheral region. The disclosure further discloses a projector adopting the fluorescent color wheel.

## Claims

### Claim 1

A fluorescent color wheel, comprising:
a substrate having at least one flow channel therein, the flow channel having a first end and a second end respectively adjacent to a central region and a peripheral region of the substrate;
a working fluid flowing in the flow channel in a gas-liquid coexistence state; and
a fluorescent powder layer disposed on the substrate and located at the peripheral region.

### Claim 2 (depends on 1)

The fluorescent color wheel of claim 1, wherein the substrate further has a plurality of the flow channels, and the flow channels are radially arranged around the central region.

### Claim 3 (depends on 2)

The fluorescent color wheel of claim 2, wherein the substrate further has at least one passageway communicated between adjacent two of the flow channels.

### Claim 4 (depends on 3)

The fluorescent color wheel of claim 3, wherein the passageway is located between the first end and the second end of any of the adjacent two of the flow channels.

### Claim 5 (depends on 1)

The fluorescent color wheel of claim 1, wherein the substrate has a centroid located in the central region, and a virtual extension line of the flow channel does not intersect the centroid.

### Claim 6 (depends on 5)

The fluorescent color wheel of claim 5, wherein the substrate is configured to rotate along a rotational direction based on the centroid, and the virtual extension line is offset relative to a radial extension line passing through the centroid and the first end based on the first end along an opposite direction of the rotational direction.

### Claim 7 (depends on 6)

The fluorescent color wheel of claim 6, wherein the virtual extension line is offset relative to the radial extension line along the opposite direction with an angle, and the angle is greater than 0 degree and smaller than 90 degrees.

### Claim 8

A projector, comprising:
a housing;
a motor disposed in the housing and having a shaft; and
a fluorescent color wheel comprising:
a substrate having at least one flow channel therein, the flow channel having a first end and a second end respectively adjacent to a central region and a peripheral region of the substrate, wherein the substrate has a hole located at the central region and engaged with the shaft;
a working fluid flowing in the flow channel in a gas-liquid coexistence state; and
a fluorescent powder layer disposed on the substrate and located at the peripheral region.

### Claim 9 (depends on 8)

The projector of claim 8, wherein the shaft has a central axis, and a virtual extension line of the flow channel does not intersect the central axis.

### Claim 10 (depends on 9)

The projector of claim 9, wherein the motor is configured to make the substrate rotate along a rotational direction through the shaft, and the virtual extension line is offset relative to a radial extension line passing through the central axis and the first end based on the first end along an opposite direction of the rotational direction.