Emergency lamp and wireless emergency lamp data transmission system

• US 7,929,867 B2
• Filed: 08/05/2009
• Issued: 04/19/2011
• Est. Priority Date: 10/24/2002
• Status: Expired due to Fees

• Current Assignee: Ichimaru Co., Ltd.
• Original Assignee: Nakagawa Laboratories, Inc.
• Inventors: Nakagawa, Masao
• Primary Examiner(s): PASCAL, LESLIE C
• Application Number:
  US12/461,229
• Publication Number:
  US 20090297157A1
• Time in Patent Office: 622 Days
• Field of Search: 398/172
• US Class Current: 398/172
• CPC Class Codes: F21K 9/20 Light sources comprising attachment means
• CPC Class Codes: F21K 9/65 specially adapted for changing the characteristics or the distribution of the light, e.g. by adjustment of parts
• CPC Class Codes: F21V 33/0052 Audio or video equipment, e.g. televisions, telephones, cameras or computers; Remote control devices therefor
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G09F 9/33 being semiconductor devices, e.g. diodes
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/3025 Electromagnetic shielding
• CPC Class Codes: H04B 10/1141 One-way transmission
• CPC Class Codes: H04B 10/1149 Arrangements for indoor wireless networking of information
• CPC Class Codes: H04B 10/116 Visible light communication
• CPC Class Codes: H04B 2203/5412 by modofying wave form of the power source
• CPC Class Codes: H04B 2203/5458 Monitor sensor; Alarm systems
• CPC Class Codes: H04B 3/54 Systems for transmission via power distribution lines
• CPC Class Codes: H05B 47/185 via power line carrier transmission
• CPC Class Codes: H05B 47/195 the transmission using visible or infrared light
• CPC Class Codes: H05B 47/1965 using handheld communication devices

Abstract

An LED is used as a light source of the emergency light. Data are normally received through a power line, demodulated at a modem section, and stored in a data memory. In an emergency, a change sectio switches the power line to a battery, and LED emits light and functions as the emergency light. At this time, the data stored in the data memory is read and demodulated at a light modulation section, and used to control blinking of the LED and the light intensity. Thereby, the data can be transmitted by the light. In an emergency, information on an emergency exit, an escape route, etc. can be received, if a mobile terminal having a light-receiving section receives the light from the emergency light.

Claims

1. An emergency lamp comprising:

a battery;

a light source;

a storage unit that stores data;

an optical modulator that controls electric power supplied to the light source from the battery in accordance with the data stored in the storage unit, thereby controlling light intensity or blinking of the light source; and

a demodulator that separates and demodulates the data superimposed on a voltage of an external power source while the emergency lamp is being driven by the external power source during a non-emergency time,

wherein data captured by the modulator is stored in the storage unit.

2. The emergency lamp according to claim 1, wherein the light source is an LED.

3. The emergency lamp according to claim 1, wherein the light source is illuminable without electric power from the external power source being supplied to the light source.

4. A wireless emergency lamp data transmission system for transmitting data to a terminal unit using the emergency lamp according to claim 1.

5. The wireless emergency lamp data transmission system according to claim 4, wherein the terminal unit comprises:

a light receiving unit that receives light emitted from the light source and converts the light to an electric signal; and

a demodulator that demodulates the electric signal, thereby capturing the data.

6. The wireless emergency lamp data transmission system according to claim 4, wherein the light source is illuminable without electric power from the external power source being supplied to the light source.

7. The wireless emergency lamp data transmission system according to claim 4, wherein the light source is illuminated during an emergency.