DRIVE DEVICE AND PROJECTION-TYPE IMAGE DISPLAY DEVICE

• US 20190313065A1
• Filed: 06/24/2019
• Published: 10/10/2019
• Est. Priority Date: 12/28/2016
• 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: KITADE, Naoya, IYODA, Makoto, YAMASHITA, Naoko, CHIKAYAMA, Manabu, KUBO, Atsushi
• Granted Patent: US 10,965,920 B2
• Time in Patent Office: Days
• CPC Class Codes: G03B 21/00 Projectors or projection-type viewers; Accessories therefor devices for changing pictures G03B23/00
• CPC Class Codes: G03B 21/16 Cooling; Preventing overheating
• CPC Class Codes: G03B 21/2033 LED or laser 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 21/2066 Reflectors in illumination beam in projection beam G03B21/28
• CPC Class Codes: G11B 33/12 Disposition of constructional parts in the apparatus, e.g. of power supply, of modules
• CPC Class Codes: G11B 33/142 by air cooling
• CPC Class Codes: G11B 33/1466 sealing gaskets, gasket in general F16J
• CPC Class Codes: G11B 33/148 Reducing friction, adhesion, drag
• CPC Class Codes: H04N 9/3141 Constructional details thereof details not peculiar to the presence of an electronic spatial light modulator G03B21/14

Abstract

A drive device includes a housing in which a gas is sealed, wherein density of the gas is lower than density of air, a driven object housed inside the housing, a driver configured to drive the driven object, a current detector configured to detect a value of a current flowing into the driver, and a determinator configured to determine a concentration of the gas inside the housing based on the value of the current detected.

Claims

1. A drive device comprising:

a housing in which a gas is sealed, wherein density of the gas is lower than density of air;

a driven object housed inside the housing;

a driver configured to drive the driven object;

a current detector configured to detect a value of a current flowing into the driver while the driven object is driven by the driver; and

a determinator configured to determine a concentration of the gas inside the housing based on the value of the current detected.

2. The drive device according to claim 1,

wherein thermal conductivity of the gas is higher than thermal conductivity of air.

3. The drive device according to claim 1, wherein the driver drives the driven object based on a result determined by the determinator about the concentration of the gas.

4. The drive device according to claim 3, wherein when the determinator determines that the concentration of the gas is lower than a predetermined concentration, the driver drives the driven object at a rate slower than a rate for a concentration of the gas that is determined by the determinator to be greater than or equal to the predetermined concentration.

5. The drive device according to claim 3,

wherein when the determinator determines that the concentration of the gas is lower than a predetermined concentration, the driver drives the driven object at a rate faster than a rate for a concentration of the gas that is determined by the determinator to be greater than or equal to the predetermined concentration.

6. The drive device according to claim 3,

wherein when the determinator determines that the concentration of the gas is lower than a predetermined concentration, the driver stops driving the driven object.

7. A projection-type image display device comprising:

a housing in which a gas is sealed, wherein density of the gas is lower than density of air;

a phosphor wheel housed inside the housing;

a driver configured to rotate the phosphor wheel;

a current detector configured to detect a value of a current flowing into the driver while the phosphor wheel is rotated by the driver; and

a determinator configured to determine a concentration of the gas inside the housing based on the value of the current detected.

8. The projection-type image display device according to claim 7, further comprising a laser light irradiator configured to irradiate the phosphor wheel with laser light,

wherein when the determinator determines that the concentration of the gas is lower than a predetermined concentration, the laser light irradiator decreases output of the laser light to a level lower than a level for a concentration of the gas that is determined by the determinator to be greater than or equal to the predetermined concentration.

9. The projection-type image display device according to claim 7, further comprising a notification unit configured to send a notification to a user when the determinator determines that the concentration of the gas is lower than a predetermined concentration.