Optical: systems and elements – Lens – With support
Reexamination Certificate
2002-02-20
2004-02-17
Dang, Hung Xuan (Department: 2873)
Optical: systems and elements
Lens
With support
C359S811000, C396S526000, C362S455000, C353S100000
Reexamination Certificate
active
06693751
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a member mounting structure and a mounting apparatus for mounting a member such as a solid state image input unit, more specifically, relates to a member mounting structure and a member mounting apparatus for mounting a member such as a solid state image input unit utilized in copying machine, facsimile machine, image scanner and so on, in which an optical image is read by utilizing the solid state image input unit.
BACKGROUND OF THE INVENTION
Generally, an image forming apparatus in which optical image is input as optical signal using a solid state image input unit such as CCD, inputs image of object
1
focused on solid state image input unit
3
through image forming lens unit
2
as shown in FIG.
46
. In the solid state image input unit
3
, one line of the solid state image input unit is utilized in which plurality of micro photoelectric converting devices (hereinafter it is referred to as merely “pixel”, which usually has a small dimension of some micrometers square) are arranged in a straight line.
In the image input unit as above described, in order to arrange a line image which is focused by the image forming lens unit
2
, on the solid state image input unit and at the same time, in order to read out optical characteristics (focus, magnification and so on) in a predetermined accuracy level, it is required that the image forming lens unit
2
and the pixel line
4
of a line of solid state image input unit
3
are adjusted their position by micro movement along three axis directions such as X, Y and Z axes, and around two rotational directions such as &bgr; rotation around Y axis and &ggr; rotation around Z axis (hereafter rotational directions around the two axes referred merely to as movements along axes such as &bgr; axis and &ggr; axis, and X, Y, Z, &bgr; and &ggr; axes are merely referred to as five axes.) as shown in FIG.
47
. At this time, the reference numeral
5
in
FIGS. 46
,
47
designates an axis of the lens unit
2
.
At this point, the reason why an adjustment around X axis is not performed is that the distances between the image forming lens unit
2
and respective pixels of the solid state image input unit
3
, become not different even when the adjustment along the X axis is not performed, because the X axis is located along (in parallel to) a direction of the line of pixels, in comparison with that the adjustments around the &bgr; and &ggr; axes cause the accuracy of optical characteristics to deteriorate because the distances between the image forming lens unit
2
and respective pixels of the solid state image input unit
3
become different when the adjustment around the &bgr; axis and &ggr; axis are not performed.
In the mean time, in order to input colored images there is a case in that the solid state image input unit
6
in which pixel R(
6
a
), B(
6
b
) and G(
6
c
) having a peak of the spectroscopic sensitivity in Red (hereinafter referred to as merely “R”), Green (hereinafter referred to as merely “G”) and Blue (hereinafter referred to as merely “B”) respectively, are arranged in three lines respectively, is used as shown in FIG.
48
.
Usually, accurate positioning adjustment of such solid state image input unit
6
is requested in high precision for every five dimension respectively, and what is seemed to be indispensable to attain the request is a technology by which positional discrepancy of positioning of solid state image input unit
6
is not happened when the solid state image input unit
6
is fixed onto a frame after the position of solid state image input unit
6
is adjusted as above stated.
The reason why such technology is requested is because even the positioning has been adjusted with high precision, when positional discrepancy happens at fixing, positioning adjustment must be performed again or separable members must be scraped in case of the fixing method in which parts are not separable.
To solve this kind of inconvenience it may take into consideration that complicated structural parts composed with arrowheads, balls and springs instead of screws are utilized, however, the cost increases much more because the complicated structural parts are expensive.
Accordingly, at present a fixing by adhesive material is mainly tried which is thought that amount of positional discrepancy is much less than that by screws and that problem regarding to number of members is much less. There are two methods in the fixing by adhesive material when it is classified roughly, one is a method for the case that objects to be fixed together are contacting each other, and another is a method for the case that objects to be fixed together are not contacting with a space.
At this time, the former is called as contacting adhering method and the latter is called as caulking adhering method.
In the caulking adhering method, there is a space which is larger than that for an adjusting, and the adhesive material is introduced and filled the space in order to fix the space. As a prior art technology of this kind in the caulking adhering method, there is a technique disclosed, for example, in Japanese Patent Laid Open Hei 7 (1995)-297993. The technology settles the space between the objects to be adhered so that the objects to be adhered would not contact each other even when they have problem of accuracy in shape and size and the adhesive material is filled between the space to fix.
Also, as a mounting method onto a head holding member through an ultraviolet curing adhesive material, there is a method as shown in FIG.
49
.
In the method shown in
FIG. 49
, the adhesive material
12
is painted on one surface of a work piece
11
and the work piece
11
is adjusted for its positional relation to a work piece holding member
13
as shown in FIG.
49
(A). When the work piece
11
is fixed onto the work piece holding member
13
through the adhesive material
12
, by irradiating ultraviolet to the adhesive material
12
through a light guide L from a space between the work piece
11
and the work piece holding member
13
, the adhesive material
12
is hardened to fix the work piece
11
onto the work piece holding member
13
as shown in FIG.
49
(B). At this time, when either one of the work piece
11
or the work piece holding member
13
is made of a ultraviolet transparent material, the ultraviolet may be passed through the transparent material to irradiate the adhesive material
12
.
However, in the prior art technique such as described above, because the amount of space is settled so that the objects to be fixed would not contact each other and the adhesive material is filled between the space to fix, problems as listed below have taken place.
Hereinafter, this caulking adhering method will be explained with reference to a drawing of one example as shown in
FIG. 50
, and the problems of it will be concretely explained.
In
FIG. 50
, the reference numeral
14
designates a work piece to be adhered,
15
designates a work piece holding member and
16
designates the adhesive material, the work piece
14
will be fixed onto the work piece holding member
15
by caulking the adhesive material
16
between the work piece
14
and the work piece holding member
15
and hardened in this example.
To adhere and fix the work piece
14
on the work piece holding member
15
without contacting each other, a space B is required in order to keep a space to be filled by the adhesive material
16
so that the adhered surface
14
a
of work piece
14
and the adhered surface
15
a
of work piece holding member
15
would not contact each other even when an amount of dispersion in positional discrepancy is A (space for positioning adjustment of the work piece
14
) at the adhered surface
14
a
of work piece
14
, and an amount of dispersion in positional discrepancy C at the adhered surface
15
a
of work piece holding member
15
, occur.
In consequence of this, the film thickness of adhesive material
16
varies from B at the minimum and to A+B+C at the maximum, then it becomes dispersing in a rang
Ando Jun
Fujita Shigeru
Kobayashi Shigeo
Morii Yoshihiro
Takemoto Hiroshi
Dang Hung Xuan
Martinez Joseph
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