HALF MIRROR FRONT PLATE

• US 20140300979A1
• Filed: 04/04/2014
• Published: 10/09/2014
• Est. Priority Date: 04/05/2013
• Status: Abandoned Application

• Current Assignee: Asahi Glass Company, Limited (AGC, Inc.)
• Original Assignee: Asahi Glass Company, Limited (AGC, Inc.)
• Inventors: TOMIDA, Michihisa, SASAKI, Koji
• Application Number:
  US14/245,133
• Publication Number:
  US 20140300979A1
• Time in Patent Office: Days
• US Class Current: 359/839
• CPC Class Codes: G02B 27/144 using partially transparent surfaces without spectral selectivity G02B27/147 takes precedence
• CPC Class Codes: G02B 5/205 Neutral density filters

Abstract

To provide a half mirror front plate which has luminous transmittance and luminous reflectance enough to function as a half mirror for display, provides color tones of transmitted light and reflected light close to neutral (visually white), and is excellent in productivity. A half mirror front plate for display includes a stack consisting of a transparent substrate and a half mirror stacked film arranged on one principal surface of the transparent substrate, wherein the half mirror stacked film has a first transparent oxide layer with a thickness of 45 nm to 70 nm made of a first metal oxide, a metal layer with a thickness of 30 nm to 45 nm mainly made of silver, and a second transparent oxide layer with a thickness of 45 nm to 70 nm made of a second metal oxide in order from the transparent substrate side.

Claims

1. A half mirror front plate for display, comprising:

a stack consisting of a transparent substrate and a half mirror stacked film arranged on one principal surface of the transparent substrate,

wherein the half mirror stacked film has a first transparent oxide layer with a thickness of 45 nm to 70 nm made of a first metal oxide, a metal layer with a thickness of 30 nm to 45 nm mainly made of silver, and a second transparent oxide layer with a thickness of 45 nm to 70 nm made of a second metal oxide, in order from the transparent substrate side.

2. The half mirror front plate according to claim 1,

wherein the stack has a luminous transmittance by a C light source measured according to JIS Z8701 (1999) of 30% to 50% and a luminous reflectance of 40% to 60%.

3. The half mirror front plate according to claim 1,

wherein the metal layer contains 0.2 mass % to 10 mass % of gold and/or palladium to a total mass of constituent metals of the metal layer.

4. The half mirror front plate according to claim 1,

wherein both the first metal oxide and the second metal oxide contain, as a main component, a zinc oxide containing zinc as a main oxide constituent metal.

5. The half mirror front plate according to claim 4,

wherein the zinc oxide contains one or more selected from a group consisting of aluminum, titanium and gallium, as oxide constituent metals.

6. The half mirror front plate according to claim 1, further comprising:

a protective layer containing a tin oxide and/or an indium oxide as a main component on the half mirror stacked film.

7. The half mirror front plate according to claim 1,

wherein the transparent substrate is made of glass.

8. The half mirror front plate according to claim 1,

wherein the transparent substrate is made of resin, and the resin is polyester, cycloolefin polymer, polycarbonate, or triacetylcellulose.

9. The half mirror front plate according to claim 8, further comprising:

a hard coat layer on another principal surface of the transparent substrate.

10. The half mirror front plate according to claim 8, further comprising:

an adhesive layer on the half mirror stacked film.

11. The half mirror front plate according to claim 10, further comprising:

a glass plate on the adhesive layer.

12. The half mirror front plate according to claim 11,

wherein a luminous transmittance by a C light source measured according to JIS Z8701 (1999) is 25% to 50% and a luminous reflectance is 45% to 65%.