Optical: systems and elements – Lens – With support
Reexamination Certificate
2001-06-26
2004-09-21
Mack, Ricky (Department: 2873)
Optical: systems and elements
Lens
With support
C359S822000, C359S823000
Reexamination Certificate
active
06795257
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a fixing structure for parts of optical element, particularly it relates to a fixing structure for parts of optical element which is utilized in copying machine, facsimile machine, image scanner and so on, in which the solid state image forming device is used to input optical image.
BACKGROUND OF THE INVENTION
Generally an image data input apparatus in which optical image is input as optical signal using solid state image forming device such as CCD, inputs image of object
901
focused on solid state image forming device
903
through image focusing lens
902
as shown in FIG.
14
. In the solid state image forming device
903
, one line of solid state image forming device is utilized in which plurality of micro photoelectric transforming devices (hereinafter it is referred to as merely “pixel”, which usually has a small dimension of some micrometers square) are arranged in straight line.
Recently, in order to input colored images there is a case in that the solid state image forming device
906
in which pixel R(
906
a
), G(
906
b
) and B(
906
c
) having a peak of 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.
15
.
Usually accurate positioning adjustment of such solid state image forming device
906
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 discrepancy of positioning of solid state image forming device
906
is not happened when the solid state image forming device
906
is fixed onto a flame after the position of solid state image forming device
906
is adjusted as above stated.
The reason such technology is requested is because even the positioning has been adjusted with high precision, when discrepancy is happened at fixing, positioning adjustment must be needed again or separable parts must be scraped when the fixing method includes separable but not adjustable parts.
Up to now the fixing is mainly achieved by screws, however, when such kind of fixing method is utilized, a problem is happened that an amount of discrepancy becomes large such an ranged between some tens micro meters and some hundreds micro meters
To solve this kind of inconvenience it may take into consideration that complicated mechanism and parts comprising arrowheads, balls and springs instead of screw are utilized, however, the cost increases much more because the components are expensive.
Accordingly, at present a fixing by adhesive material is mainly tried which is thought that amount of discrepancy is much less than that by screws and that problem regarding to number of parts 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 in contacting each other, and another is a method for the case that objects to be fixed together is not contacting with space.
Herein the former is called as contacting adhering method and the latter is called as causing adhering method.
In the caulking adhering method, there is a space which is larger than that for space adjusting, and the adhesive material is introduced and filled the apace in order to fix. As a prior art technology of this kind of caulking adhering method, it is disclosed, for example, in Japanese Patent Laid Open No. Hei 7-297998. 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 an attaching method onto a head holding member through an ultraviolet setting adhesive material, there is a method as shown in FIG.
16
.
In the method shown in
FIG. 16
, adhesive material
912
is painted on one surface of a work piece
911
and the work piece
911
is adjusted for its positional relation to a work piece holding member
913
as shown in FIG.
16
(A). When the work piece
911
is fixed onto the work piece holding member
913
through the adhesive material
912
, by irradiating ultraviolet to the adhesive material
912
through a light guide L from a space between the work piece
911
and the work piece holding member
913
, the adhesive material
912
is hardened to fix the work piece
911
onto the work piece holding member
913
as shown in FIG.
16
(B). Herein, when either one of the work piece
911
or the work piece holding member
913
is made of a ultraviolet transparent material, the ultraviolet may be passed through the transparent material to irradiate the adhesive material
912
.
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. 17
, and the problems of it will be concretely explained.
In
FIG. 17
, the reference numeral
914
designates a work piece to be adhered,
915
designates a work piece holding member and
916
designates the adhesive material, the work piece
914
will be fixed onto the work piece holding member
915
in this example.
To adhere and fix the work piece
914
on the work piece holding member
915
without contacting each other, a space B is required in order to keep a space to be filled by the adhesive material
916
so that the adhering surface
914
a
of work piece
914
and the adhering surface
915
a
of work piece holding member
915
would not contact each other even when an amount of dispersion in positional discrepancy is A (spacing for positioning adjustment of work piece
914
) at the adhering surface
914
a
of work piece
914
, and an amount of dispersion in discrepancy C at the adhering surface
915
a
of work piece holding member
916
, occur. In consequence of this the film thickness of adhesive material
916
varies from B at the minimum and to A+B+C at the maximum, then it becomes dispersing in a range A+C.
Further, it may also become dispersing in a range I+J because of influence of a surface accuracy in the adhering surface
914
a
of work piece
914
and the adhering surface
915
a
of work piece holding member
915
.
Generally, as the adhesive material shrinks when it is hardened, it becomes important that the film thickness of adhesive material must be reduced as little as possible in order not for the objects to be fixed to have the positional discrepancy after the adhesive material has been hardened. On the contrary, as the film thickness of adhesive material can not be made less than B in the above described caulking adhering methods there was a case in that an improvement in the amount of positional discrepancy after fixing, could not be realized because changing of film thickness as a counter measure could not be applied even the positional discrepancy happened with amount much larger than the tolerable amount when the film thickness of adhesive material is B.
And because the dispersion of the film thickness happens within a range of A+C, the amount of shrinkage at the adhesive material after fixing, changes together in accordance with the dispersions In the consequence of this, the position of work piece
914
also disperses and there was a case in that the required accuracy could not be maintained. Commonly the volume shrinkage rate of ultraviolet setting adhesive material is in a range from 5 to 10 percent. Presuming a case that the volume shrinkage rate is 7%, it shrink about 2% in each respective three directions when the hardening shape of adhesive material is cubic.
In consequence of this, when the difference in a level of about 0.5 mm occurs in the film th
Andoh Jun
Kobayashi Toshio
Morii Yoshihiro
Ono Nobuaki
Takemoto Hiroshi
Mack Ricky
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ricoh & Company, Ltd.
Thomas Brandi
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