Electric heating device for mirror

• US 5,990,449 A
• Filed: 06/29/1995
• Issued: 11/23/1999
• Est. Priority Date: 11/04/1993
• Status: Expired due to Fees

• Current Assignee: Pentel Kabushiki Kaisha
• Original Assignee: Pentel Kabushiki Kaisha
• Inventors: Nagaoka, Makoto, Sugiyama, Tetsuya, Ueda, Yoshiya, Tazunoki, Hiroshi
• Primary Examiner(s): Hoang, Tu Ba
• Application Number:
  US08/492,083
• Time in Patent Office: 1,608 Days
• Field of Search: 219/202-203, 219/219, 219/522, 219/543, 359/838, 359/841, 359/850, 359/267, 338/306-309, 392/438, 392/439
• US Class Current: 219/219
• CPC Class Codes: H05B 3/845 specially adapted for reflecting surfaces, e.g. bathroom - or rearview mirrors

Abstract

In a mirror with a heater, a reflective heating resistor film, or a reflection film and a heating resistor film, are formed on a mirror base plate. The heating resistor film is provided with at least one pair of electrodes to apply electricity to and heat the film. The reflective heating resistor film, reflection film and/or heating resistor film are so arranged as to form a clear visible image and to be heated. The temperature of the mirror surface can be controlled, and the electrodes are formed so as to heat the entire surface of the mirror uniformly.

Claims

1. A mirror with a heater comprising:

a mirror base plate;

a reflective film disposed directly on the mirror base plate for providing a reflective surface on the mirror base plate;

a heating resistor film consisting essentially of titanium disposed on the reflective film for uniformly heating the reflective surface of the reflective film; and

at least one pair of opposing electrodes disposed on the heating resistor film for applying electricity to the heating resistor film to heat the reflective surface of the reflective film.

2. A mirror with a heater according to claim 1;

wherein the reflective film has a thickness of 0.05-0.15 μ

m.

3. A mirror with a heater according to claim 2;

wherein the reflective film has a thickness of 0.1 μ

m.

4. A mirror with a heater according to claim 1;

further comprising a temperature control element for controlling the temperature applied on the heating resistor film.

5. A mirror with a heater comprising:

a mirror base plate;

a reflective film disposed directly on the mirror base plate;

a heating resistor film consisting essentially of titanium disposed on the reflective film; and

at least one pair of opposing electrodes disposed on the heating resistor film to apply electricity to and heat the heating resistor film, the distance between the electrodes near corner portions of the mirror base plate being smaller than the distance between the electrodes at a central portion of the mirror base plate.

6. A mirror with a heater according to claim 5;

wherein the mirror base plate has a first side edge and a second side edge, the distance between the electrodes at the first side edge being smaller than the distance between the electrodes at the second side edge.

7. A mirror with a heater according to claim 5;

wherein the electrodes extend along opposed longitudinal edges of the mirror base plate; and

wherein the mirror base plate has a first side edge portion and a second side edge portion disposed between the longitudinal edges, the distance between the electrodes at the first side edge portion being smaller than the distance between the electrodes at the second side edge portion.