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Infrared-transmitting cover

A technology of infrared transmission and cover, applied in the direction of optics, instruments, close-range systems, etc.

Active Publication Date: 2007-10-17
TOKAI OPTICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the resin window plate used for the infrared signal interface must have infrared transmittance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0071] Hereinafter, referring to FIG. 5 , an infrared ray transmissive cover 21 according to a first embodiment of the present invention will be described.

[0072] The portable information terminal 22 as an electronic device has a transmitter and receiver for transmitting and exchanging information between other electronic devices without cables using infrared signals (for example, infrared rays with a wavelength around 850nm). Infrared communication, for example, is generally performed in accordance with the Infra-red Data Access (IrDA: Infra-red Data Access) standard. The cover 21 closes an opening (infrared signal interface) 22 a formed in the casing of the portable information terminal 22 . The lower side of FIG. 5 is the outer side of the cover 21 and each layer, and the upper side is the inner side of the cover 21 and each layer.

[0073] The cover 21 includes an infrared transmissive base layer 23 and a dielectric multilayer film 24 formed on the outer surface of the ...

Embodiment 1

[0093] Referring now to Fig. 6, Fig. 7, Table 1 and Table 2, the lid of Example 1 will be described.

[0094] The cover of Example 1 has the same layer structure as the cover 21 shown in FIG. 5 , and includes an acrylic resin base layer 23 and a dielectric multilayer film 24 that is transparent to infrared rays and reflects blue light. The dielectric multilayer film 24 is composed of eight thin film layers alternately laminating high-refractive-index material (ZrO2) and low-refractive-index material (SiO2) on the outer surface of the acrylic resin base layer 23. The dielectric multilayer film 24 reflects light having a central wavelength λc. The central wavelength λc is related to the color of the reflected light, ie to the color of the cover. The eight layers constituting the dielectric multilayer film 24 of Embodiment 1 are designed to reflect light having a central wavelength λc of 495 nm, that is, to reflect blue light.

[0095] Table 1

[0096] air side

Ma...

Embodiment 2

[0107] The cover of Example 2 has the same structure as the cover 21 of FIG. 5 and includes an acrylic resin base layer 23 and a dielectric multilayer film 24 that reflects yellow light. The dielectric multilayer film 24 is composed of seven thin film layers in which high refractive index material (ZrO2) and low refractive index material (SiO2) are alternately laminated. The center wavelength λc of the dielectric multilayer film 24 is the wavelength (600 nm) of the yellow reflected light.

[0108] The spectral reflection characteristics and the spectral reflection characteristics of the dielectric multilayer film 24 in Example 2 are shown in FIG. 8 . In FIG. 8, a curve 50 represents the spectral reflection characteristic (reflectance R) in the case of "no back reflection". Curve 51 represents the spectral transmission characteristic (transmittance T) in the case of "no back reflection". Curve 52 represents the spectral reflection characteristic (reflectance R) in the case of...

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Abstract

Disclosed is an infrared-transmitting cover (21) comprising an infrared-transmitting base layer (23) and an infrared-transmitting dielectric multilayer film (24) which is arranged on the base layer (23). The infrared-transmitting cover (21) has optical characteristics since the dielectric multilayer film (24) selectively reflects visible light in a specific wavelength range, and the cover appears in the color corresponding to the specific wavelength range. A cover according to one embodiment of the present invention appears in a color other than black, namely such as blue, yellow or green, thereby enabling to improve decoration ability of infrared signal ports of electronic devices such as portable information terminals.

Description

technical field [0001] The invention relates to an infrared transmission cover, for example, an infrared transmission cover installed on an infrared signal interface for inputting and outputting infrared signals and having good decorative properties. Background technique [0002] In short-distance wireless data communication (such as IrDA specification) between electronic devices, and in long-distance operations such as power on / off and volume change of home appliances such as televisions (TVs) and video tape recorders (VTRs) (videotape recorders), Infrared signals are generally used. [0003] The infrared signal is received by the infrared light-receiving element arranged on the receiver or the transmitting receiver. In general, infrared light receiving elements can not only detect infrared signals, but also detect visible light. In order to prevent disturbance (disturbance) light such as visible light from entering the light-receiving element, a black or dark near-infrar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0216H01L33/00G02B5/28H01L31/02H01L33/60H04B10/11H04B10/116
Inventor 橋口敬宮口章
Owner TOKAI OPTICAL CO LTD
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