Horology: time measuring systems or devices – Power supply details – Electrical
Patent
1997-07-14
1998-11-24
Miska, Vit W.
Horology: time measuring systems or devices
Power supply details
Electrical
368223, G04B 100, G04B 1900, G04C 300
Patent
active
058417389
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a display unit structure for an electronic device having a display unit which reflects a light having a predetermined wavelength and transmits lights other than the light having the predetermined wavelength.
DESCRIPTION OF THE BACKGROUND ART
Recently, a solar battery has been significantly improved in technologies and been widely used for various electronic devices as the light source for electronic watches, electronic calculators, portable radios, and the like.
As such a solar battery, an amorphous solar battery produced by applying amorphous silicon to a glass substrate or a metal substrate is generally used.
There is a case of using a solar battery of this type in a display unit structure for an electronic watch as shown in FIGS. 9 and 10.
As shown in FIGS. 9 and 10, this display unit has a structure in which four solar cells 2 of a planar fan shape are disposed in parallel on the periphery and over a movement 1, and are electrically connected in series an insulating band 3 is interposed between the solar cells 2, a transparent plane 4 formed from a polycarbonate or acryl resin is laminated on the insulating band 3 and solar cells 2, and a commercial name, characters 5 for displaying time, and the like are displayed on the transparent plane 4 by printing or the like. Incidentally, it is important that electronic watches provided with the display unit structure of this type not only have excellent functions but also exhibit an excellent appearance.
However, in conventional display unit structures for electronic watches, the solar cells 2 have a dark brown or dark blue color so that the watch display is viewed as if it has a dark brown or dark blue color. Also, since the insulating band 3 is interposed between the solar cells 2, it is viewed as a material with a planar cross shape. There are substantial limitations to the design including the color tone of the watches and the product quality is also degraded.
There is a display unit structure for an electronic device disclosed in Japanese Patent Publication No. 38464/1993 to solve the above problems.
This display unit structure for an electronic device comprises a solar battery for supplying power to a movement for driving a device, a color filter capable of transmitting a light of a wavelength contributing to power generation of the solar battery, and a scattering layer made of a white scattering plate which transmits part of the light from the color filter and scatters the remainder in all directions.
Here, the scattering layer is, for example, made of an acrylic opaque plate, produced by applying a delustering clear lacquer on a half mirror, or produced by roughing one of the surfaces, the other surface being laminated with aluminum to form a mirror.
However, in these display unit structures for electronic devices, the former scattering layer is seen as a darkish white because it must partially transmit light, whereby, for example, a metallic color which exhibits a high-class appearance cannot be provided. On the other hand, in the latter scattering layer, the light transmission varies and a color shade occurs due to uneven layer thickness. As a result, the display unit cannot be provided with the desired color tone, causing the problem that the degree of freedom in designing the appearance decreases.
In addition, in the conventional display unit structures for electronic devices a light having a predetermined wavelength is scattered in all directions. When an observer views a display unit, the scattered light can be viewed not only from a specific direction along the usual line of sight but also from all the directions. The transmittable light transferred to a solar battery is reduced and hence the utilization efficiency of the light is reduced.
Accordingly, the present invention has been achieved in view of this situation and has an object of providing a display unit structure in which a display device includes a hologram layer provided with a virtual mirror plane for reflecting a light having a pr
REFERENCES:
patent: 4834475 (1989-05-01), Robinson
patent: 5586089 (1996-12-01), McGarvey
Kamei Yuichi
Kamiyama Yasuo
Katsuki Yoshio
Mafune Masao
Citizen Watch Co. Ltd.
Miska Vit W.
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