Patent Application
20120145220
1. Technical Field
The present disclosure relates to the solar energy application field, and particularly, to a dichroic mirror having a transparent bonding layer, and a sunlight collecting device including the dichroic mirror.
2. Description of Related Art
Sunlight has been widely collected for obtaining electrical energy. Most energy of the sunlight is concentrated in a wavelength range from 380 nm to 2000 nm. However, a sunlight sensor of a typical sunlight collecting device cannot sense all the sunlight in the aforementioned wavelength range. That is, the utilization of the sunlight is inefficient. Therefore, it is desired to provide a sunlight collecting device which can overcome at least one of the described shortcomings.
Many aspects of the present disclosure can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure.
Embodiments of the present disclosure will now be described in detail and with reference to the drawings.
Referring to
The first and second multilayer dielectric 20, 40 are respectively formed on the first transparent substrate 10 and the second transparent substrate 50 using a typical chemical deposition process, physical vapor deposition process or vacuum evaporation process. The first multilayer dielectric 20 and the second multilayer dielectric 40 are directly pressed onto two opposite surfaces of the transparent bonding layer 30. Each layer of the first multilayer dielectric 20 and each layer of the second multilayer dielectric 40 can be made of a material selected from a group consisting of niobium oxide, thallium oxide, titanium oxide, silicon oxide, and aluminum oxide. The first and second multilayer dielectric 20, 40 can respectively include 15-40 layers, and a thickness of each layer is in a range from about 55 nm to 125 nm.
When sunlight, designated with capital B, irradiates onto the incident surface 51 of the second transparent substrate 50, the sunlight with wavelength in a range of about 380 nm to about 2000 nm is separated into two light beams having different wavelength ranges, herein respectively designated with capital B1, and B2. In detail, one light beam B1 passes the second transparent substrate 50, and then is reflected by the second multilayer dielectric 40, and emits out of the dichroic mirror 100 from the incident surface 51. Another light beam B2 successively passes the second multilayer dielectric 40, the bonding layer 30, the first multilayer dielectric 20, and emits out of the dichroic mirror 100 from the emitting surface 11.
In the present embodiment, the bonding layer 30 provides adhesive force, avoiding the first multilayer dielectric 20 and the second multilayer dielectric 40 respectively falling off from the first transparent substrate 10 and the second transparent substrate 50. In addition, the first and second transparent substrates 10, 50 isolates water contained in atmosphere entering into the first and second multilayer dielectric 20, 40, extending the lifetime of the dichroic mirror 100.
Referring also to
The reflector 60 has a parabolic cross-section and is arranged on a light path of the dichroic mirror 100. The reflector 60 includes a parabolic reflection surface 61 facing the first transparent substrate 10 of the dichroic mirror 100. The reflection surface 61 reflects the light beam B2.
The first sunlight sensor 300 is arranged on the focus of the dichroic mirror 100, and senses the light beam B1. The second sunlight sensor 400 is arranged on the focus of the reflector 60, and senses the light beam B2 reflected from the reflection surface 61. The first and second sunlight sensors 300, 400 optically communicate with the solar battery 600 through the optical fiber cable 500. As such, sunlight having wavelength ranged from about 380 nm to about 2000 nm is entirely transmitted to the solar battery 600, improving energy converting rate.
The described embodiments are intended to illustrate rather than limit the disclosure. Variations may be made to the embodiments and methods without departing from the spirit of the disclosure. Accordingly, it is appropriate that the appended claims be construed broadly and in a manner consistent with the scope of the disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 99143287 | Dec 2010 | TW | national |
