Batteries: thermoelectric and photoelectric – Photoelectric – Panel or array
Reexamination Certificate
2002-03-25
2004-10-12
Diamond, Alan (Department: 1753)
Batteries: thermoelectric and photoelectric
Photoelectric
Panel or array
C136S244000, C136S256000, C136S246000, C136S259000, C438S064000, C438S067000, C438S066000, C257S433000, C257S503000, C257S666000, C257S668000, C257S692000, C257S701000, C257S712000, C257S713000, C257S725000, C052S173300
Reexamination Certificate
active
06803514
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a photoelectric device such as a solar cell (including a photovoltaic element), a photoelectric sensor or the like. More particularly, the present invention relates to a structure and a method for mounting a photovoltaic element. The present invention also relates to a semiconductor-element mounting substrate having a circuit pattern for a semiconductor element and which is used for mounting said semiconductor element on said substrate and a method for mounting a semiconductor element on said substrate.
2. Related Background Art
In recent years, the global warming of the earth because of the so-called greenhouse effect to an increase in the content of CO
2
gas in the air has been predicted.
In view of this, there is an increased demand for the development of clean energy sources with no accompaniment of CO
2
gas exhaustion. As one of such clean energy sources, there can be mentioned atomic power generation. However, for the atomic power generation, there are problems that are difficult to be solved, such as radioactive wastes and the like which cause air pollution. Also in view of this, there is an increased demand for providing clean energy sources which are highly safe and do not exhaust air-polluting substances.
Under these circumstances, public attention has now focused on a solar cell in which one or more photovoltaic elements are used and which converts sunlight into electric energy as a clean energy source, because it does not exhaust contaminants and it is safe and can be readily handled.
As such solar cell, there are known have a variety of solar cells. And some of them have been using as power generation sources in practice. These solar cells include crystalline series solar cells in which a single crystal silicon material or a polycrystalline silicon material is used, amorphous series solar cells in which amorphous silicon material is used, and compound semiconductor series solar cells in which compound semiconductor material is used. Besides, there are known a variety of configurations for these solar cells to be practically used. Specifically, there are known, for instance, a frame type solar cell as disclosed in Japanese Laid-open Patent Application No. 82820/1993, a frame-less type solar cell as disclosed in Japanese Laid-open Patent Application No. 131048/1995, a roofing material-integral type solar cell as disclosed in disclosed in Japanese Laid-open Patent Application No. 177187/1996or Japanese Laid-open Patent Application No. 97727/1999, and an optical-concentration type solar cell as disclosed in Japanese Laid-open Patent Application No. 83006/1997.
For any of these solar cells, the material cost of the cell (the photoelectric conversion element) constituting the solar cell accounts for the largest rate of the cost of the solar cell. Thus, in order to reduce the cost of the solar cell, it is an important factor to diminish the use amount of the material constituting the cell (the photoelectric conversion element). The optical-concentration type solar cell is of the configuration in that in order to reduce the power generation cost by making full use of the ability of a photoelectric conversion element (a cell) used therein which is costly, sunlight is converged and condensed to several times to several hundreds times by means of a condenser lens to increase the quantity of incident light to the photoelectric conversion element, whereby diminishing the use amount of the photoelectric conversion element.
Aforementioned Japanese Laid-open Patent Application No. 83006/1997 specifically discloses a solar cell module having an optical-concentration structure in that a solar cell comprising a compound semiconductor material such as GaAs or the like is arranged on a retaining substrate constituted by glass, resin or ceramics, a reverse taper-like concaved portion whose open area being upward widened is arranged above the solar cell, and a light-converging structural body with a high refraction factor and which comprises a resin such as polystyrene and has a surface processed into a lens-like form is accommodated in said concaved portion. Separately, Japanese Laid-open Patent Application No. 231111/1995 discloses a substrate for an optical-concentration type solar cell. This substrate has a structure in that a plurality of small solar cells are connected respectively to a standard IC-type carrier comprising a dual in-line package or the like and the carriers are attached to a print substrate comprising a throughhole substrate or the like to establish electrical connection between the carriers.
FIG.
13
(A) is a schematic external view illustrating an example of a conventional optical-concentration type solar power generation system comprising
20
optical-concentration type solar cell modules
115
arranged on a frame of a sun-chasing apparatus
109
. FIG.
13
(B) is a schematic cross-sectional view taken along the B-B′ line in FIG.
13
(A), illustrating the structure of one of the 20 optical-concentration type solar cell modules
115
.
FIG. 14
is a schematic diagram illustrating the configuration of neighborhood of given photovoltaic elements
100
in the light receiving face side of the solar power generation system shown in FIGS.
13
(A) and
13
(B), when viewed from above. In FIGS.
13
(A),
13
(B) and
14
, reference numeral
100
a photovoltaic element, reference numeral
101
a circuit board, reference numeral
102
a silver paste, reference numeral
103
a heat sink, reference numeral
104
a circuit pattern, reference numeral
106
a power output electrode, reference numeral
108
a power output lead wire, reference numeral
108
′ a power output cable, reference numeral
109
a sun-chasing apparatus and reference numeral
110
a Fresnel lens.
Particularly, the optical-concentration type solar power generation system shown in FIGS.
13
(A) and
13
(B) and
FIG. 14
is configured in that the 20 optical-concentration type solar cell modules
115
are arranged on the frame of the sun-chasing apparatus
109
to establish a solar cell module array in which the 20 optical-concentration type solar cell modules
115
are arrayed in an arrangement comprising 5 rows×4 columns, each row comprising 4 of the solar cell modules and each column comprising 5 of the solar cell modules. The sun-chasing apparatus
109
is provided with a driving mechanism to move the frame having the solar cell module array thereon so as to chase the sun. A power generated by the solar cell module array is outputted to the outside through the power output cable
108
′ connected to the power output lead wires
108
extending from the solar cell modules
115
.
As will be understood with reference to FIG.
13
(B) and
FIG. 14
, each optical-concentration type solar cell module
115
is provided with a photovoltaic element
100
mounted on a circuit board
101
through a pair of circuit patterns
104
provided on the circuit board
101
, a Fresnel lens
110
in order to converge incident sunlight to the photovoltaic element
100
, and a heat sink
103
in order to cool the photovoltaic element
100
. The two circuit patterns
104
are provided respectively with an electrode
106
to which the power output lead wire
108
is connected so that a power generated by the photovoltaic element
100
is outputted to the outside. The circuit board
101
is fixed to the heat sink
103
through a silver paste
102
,
Description will be made of the photovoltaic element
100
used in the optical-concentration type solar cell module
115
and the method of mounting the photovoltaic element on the circuit board
101
with reference to
FIG. 15
[FIGS.
15
(A) to
15
(D)],
FIG. 16
[FIGS.
16
(A) to
16
(D)] and
FIG. 17
[FIGS.
17
(A) to
17
(C)].
FIG.
15
(A) is a schematic external view illustrating an example of a single-crystal photovoltaic element used in the optical-concentration type solar cell module, when viewed from the light receiving face side. FIG.
15
(
Canon Kabushiki Kaisha
Diamond Alan
Fitzpatrick ,Cella, Harper & Scinto
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