Half mirror, method for manufacturing the same and lighting unit using the same
First Claim
1. A half mirror which receives light and reflects a part of the light while transmitting another part of the light from a base material, the half mirror comprising:
- the base material, which has a first surface and a second surface formed in a substantially planar shape, the base material being made from a transparent material and comprising a polycarbonate resin; and
a half mirror layer formed on at least one of the first surface and the second surface of the base material as a chromium oxide layer of only one layer having a layer thickness,wherein a minimum of a ratio of oxygen to chromium in a thickness direction of the half mirror layer toward the base material is at least 0.55, and a maximum of the ratio of oxygen to chromium in the thickness direction of the half mirror layer toward the base material is at most 0.86, andwherein a minimum amount of oxygen in the chromium oxide layer in the thickness direction of the half mirror layer toward the base material is at least 35 atomic percent, and a maximum amount of oxygen in the chromium oxide layer in the thickness direction of the half mirror layer toward the base material is at most 46 atomic percent.
1 Assignment
0 Petitions
Accused Products
Abstract
A half mirror, a method for manufacturing the half mirror and a lighting unit using the half mirror can include a base material and a half mirror layer formed on the base material. The half mirror layer can include a chrome oxide layer, which is made by only a sputtering method, and can be configured to perform a high thermal resistance. Accordingly, the half mirror cannot crack even under various circumstances such that repeat low/high temperatures. Thus, the disclosed subject matter can provide half mirrors having a high durability such as a thermal resistance and methods for manufacturing such the half mirrors in simple manufacturing processes, and also can provide lighting units using the half mirror having a high durability, which can maintain a stable reflectivity for a long term and which can also maintain a good appearance for a long-term use because the half mirror can prevent cracking therein.
5 Citations
9 Claims
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1. A half mirror which receives light and reflects a part of the light while transmitting another part of the light from a base material, the half mirror comprising:
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the base material, which has a first surface and a second surface formed in a substantially planar shape, the base material being made from a transparent material and comprising a polycarbonate resin; and a half mirror layer formed on at least one of the first surface and the second surface of the base material as a chromium oxide layer of only one layer having a layer thickness, wherein a minimum of a ratio of oxygen to chromium in a thickness direction of the half mirror layer toward the base material is at least 0.55, and a maximum of the ratio of oxygen to chromium in the thickness direction of the half mirror layer toward the base material is at most 0.86, and wherein a minimum amount of oxygen in the chromium oxide layer in the thickness direction of the half mirror layer toward the base material is at least 35 atomic percent, and a maximum amount of oxygen in the chromium oxide layer in the thickness direction of the half mirror layer toward the base material is at most 46 atomic percent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification