Drive device and projection-type image display device

• US 10,965,920 B2
• Filed: 06/24/2019
• Issued: 03/30/2021
• 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
• Primary Examiner(s): Dowling, William C.
• Application Number:
  US16/449,981
• Publication Number:
  US 20190313065A1
• Time in Patent Office: 645 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,

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.

2. 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,

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.

3. 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,

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

4. 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.

5. The projection-type image display device according to claim 4, 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.

6. The projection-type image display device according to claim 4, 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.