LIGHTING APPARATUS AND PROJECTION-TYPE IMAGE DISPLAY APPARATUS

• US 20200132275A1
• Filed: 10/28/2019
• Published: 04/30/2020
• Est. Priority Date: 10/30/2018
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: YAMAMOTO, Norikazu
• Granted Patent: US 11,168,867 B2
• Time in Patent Office: Days
• CPC Class Codes: F21V 9/14 for producing polarised light
• CPC Class Codes: G02B 26/008 in the form of devices for effecting sequential colour changes, e.g. colour wheels
• CPC Class Codes: G02B 27/0955 Lenses lenses per se G02B3/00
• CPC Class Codes: G02B 27/141 using dichroic mirrors
• CPC Class Codes: G02B 5/0284 used in reflection
• CPC Class Codes: G03B 21/2013 Plural light sources
• CPC Class Codes: G03B 21/204 using secondary light emission, e.g. luminescence or fluorescence using different colours G03B33/00; if related to video signals H04N9/3197
• CPC Class Codes: G03B 21/2073 Polarisers in the lamp house peculiar to electronic spatial light modulators H04N9/3197
• CPC Class Codes: G11B 7/1356 Double or multiple prisms, i.e. having two or more prisms in cooperation
• CPC Class Codes: G11B 7/1362 Mirrors
• CPC Class Codes: H04N 9/3111 for displaying the colours sequentially, e.g. by using sequentially activated light sources sequential projection in colour photography G03B33/08
• CPC Class Codes: H04N 9/3158 for controlling the spectrum
• CPC Class Codes: H04N 9/3164 using multiple light sources

Abstract

A lighting apparatus includes: a light source generating a first color component light; a separation element partially transmitting the first color component light, partially reflecting the first color component light, and transmitting a second color component light different from the first color component light at a certain moment; an illuminant excited by the first color component light transmitted through the separation element to generate the second color component light; and an optical system combining the first color component light made incident on the separation element from the light source and reflected by the separation element with the second color component light made incident on the separation element from the illuminant and transmitted through the separation element. The separation element is configured to have variable transmittance and reflectance with respect to the first color component light.

Claims

1. A lighting apparatus comprising:

a light source generating a first color component light;

a separation element configured to partially transmit the first color component light, partially reflect the first color component light, and transmit a second color component light different from the first color component light at a certain moment;

an illuminant excited by the first color component light transmitted through the separation element to generate the second color component light; and

an optical system configured to combine the first color component light made incident on the separation element from the light source and reflected by the separation element with the second color component light made incident on the separation element from the illuminant and transmitted through the separation element, wherein

the separation element is configured to have variable transmittance and reflectance with respect to the first color component light.

2. The lighting apparatus according to claim 1, wherein

the first color component light generated by the light source is linearly polarized,

the separation element includes a dichroic mirror including a first region reflecting the first color component light and transmitting the second color component light and a second region transmitting the first and second color component lights, wherein the second region is disposed inside the first region and has a size smaller than a spot size of the first color component light incident on the dichroic mirror from the light source, and

the dichroic mirror is configured to be movable for switching whether or not the first color component light is incident on the second region.

3. The lighting apparatus according to claim 2, wherein

the dichroic mirror includes a plurality of the second regions different in size and is configured to be movable for switching which of the plurality of the second regions the first color component light is incident on.

4. The lighting apparatus according to claim 1, wherein

the first color component light generated by the light source is linearly polarized,

the separation element includes

a half-wave plate rotatably disposed, the half-wave plate rotating a polarization plane of the first color component light over a predetermined angle, and

a polarization beam splitter configured to partially transmit and partially reflect the first color component light depending on polarization of the first color component light.

5. The lighting apparatus according to claim 1, wherein the first color component light is a blue light, and the second color component light is a color component light including a green range.

6. The lighting apparatus according to claim 5, wherein the separation element reflects a color component light having a wavelength longer than a wavelength in the green range of the second color component light.

7. The lighting apparatus according to claim 1, wherein the light source is a solid-state light source element.

8. The lighting apparatus according to claim 1, wherein

the lighting apparatus further includes a first phosphor wheel device including a slit over a predetermined angular range,

the first color component light is incident on the separation element from the light source through the slit, and

the optical system combines the first color component light reflected by the separation element with the second color component light transmitted through the separation element and passing through the slit.

9. The lighting apparatus according to claim 1, wherein the phosphor is disposed on a second phosphor wheel device.

10. A projection-type image display apparatus comprising:

the lighting apparatus according to claim 1.