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Патент USA US2129522

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Sept. 6, 1938.
K. c. BURROUGHS
2,129,522
METHOD AND MEANS 'FOR ABRADING LENSES
Filed 001;. 9, 1955
KENNETH C. BURROUGHS
I
INVENTOR
BY
'
~
‘:7
,
»
Patented Sept. 6, 1938
_
UNITED ‘STATES PATENT OFFICE,
2,129,522
METHOD AND MEANS FOR- ABRADING
.
LENSES
Kenneth C. Burroughs, Rochester, N. Y., assignor
to Banach & Lomb Optical Company, Roches
ter, N. Y., a corporation of New York
Application October _9, 1935, . Serial No.“ 44,24‘! ‘
'6‘ Claims.
(Cl. 51-278)
This invention relates to the lens grinding and
polishing art wherein an abrading tool'or lap
tially “the same asthe area of the surface of the
lensto be ground or.polishe'd.'., The spindle i4 is
is moved over the surfaceof a lens to grind or
inclined, as shown in Fig.1, so that thegtool i3
polish it.
.
_
The invention is an improvement over the in-
U!
vention disclosed and claimed‘ in application
Serial No. 433,934, filed March '7, 1930, by Carl
overlies the lens L with the center of rotation of
the tool positioned substantially at the edge of in
the lens L.
,
According to the present invention, the tool i3
E. Anderson for a Method and means for abrad- ' is slightly eccentric 0n the Shaft '4 and thus. dur
ing lenses, now Patent No. 2,105,175, dated Jan.
ing rotation. moves between. the Positions indi
10 11, 1938. It is quite difilcult mechanically to lo- - cated at I!’ and i3" in Fig. 2. As stated above. 10
cats the tool and lens of that application so that when the edge of the tool contacts the center of
the edge of the tool passes exactly over the center the lens, and the edge of the lens. the Center Of
of the lens. Unless the tool and lens are so 10- the tool, itl'equll‘es great delicacy of adjustment
cated, the resultant lens will have either a raised to avoid grinding the center of the lens either
15 spot in the center due to insufficient abrading twice or not at all. By making the tool eccen- 15
20
.25
30
13
5
action, or will have a depressed spot due to double
abrading action. The only alternatives disclosed by Anderson for preventing this dimculty,
are the accurate positioning of the lens and tool
or the oscillating of the tool shaft and tool across
the lens. Both of these obviously present mechanical di?iculties.
One of the objects of the present invention is
to provide a method and means for abrading
lenses wherein»v the tool will grind the lens uni~
formly and will be worn away in a substantially
uniform manner over its entire area. Another
object is to provide a method and means for
abrading lenses wherein the tool is prevented
from grinding high or low target spots in the
center of the lens. These and other objects and
advantages reside in certain novel features of
construction, arrangement and combination of
parts and in my improved method, as will hereinafter be more fully set forth and pointed out in
tric on the shaft ll, the amount of abrading 80
tion at the center of the lens can be regulated.
It is also possible to obtain the same result by
oscillating the shaft ll about the center of curva
time during the rotation of the tool- This system.
however, introduces difficulties of mechanical
construction so that the eccentric positioning
of the tool is preferable.
The lens L and tool I: are rotated at the same
speed in opposite directions, as indicated by the
arrows in Fig. 2, or they may be rotated ‘in the
same direction. The tool and lens being of sub
stantially the same diameter and area and'rotat
ing at substantially the same speeds, the abrading
action will be uniform over the entire surfaces of
the lens and tool. The tool will thus wear away
uniformly without losing its curve so that a large
number of lenses may be ground without the ne
cessity for truing up the tool. _
The fundamental principles underlying the
the appended claims. _
Referring to the drawing:
present invention are substantially the same as
those underlying the invention disclosed in the .
_
'
Fig. 1 is a sectional view of an apparatus embodying my invention.
-i()
Fig. 2 is a schematic diagram illustrating the
overlapping relation between the tool and the
lens.
One embodiment of this invention is illustrated
in the drawing wherein L indicates a lens blank
45 which is to be operated upon. The blank L is
v.
mounted, by any suitable means, upon a block or
am able to attain the objects of my invention
and provide improved method and means for
abrading lenses wherein the tool will grind the
or other means through the pulley IS.
The diameter of the abrading tool I3 is sub-
stantially equal to the diameter of the lens L so
55 that the area of the abrading surface is substan-
25
30
35
above-mentioned application, Serial No. 433,934
?ied March '1, 1930 by Carl E. Anderson, for a
Method and means for abrading lenses. Accord- 40
ing to the present invention, however, the abrad
ing tool is mounted eccentrically and the necessity
of delicate or changing adjustments of the posi
tion of the tool, avoided.
From the foregoing it will be apparent that I 45
chuck l0 which is carried by a spindle II and
adapted to be rotated through the application of
suitable power to the pulley ii. A suitable
0 abrading tool or lap i3 is carriedby the spindle
it so that it may be rotated or driven by a belt
20
lens uniformly and will be worn away in a sub
stantially uniform manner over its entire area. 50
Various modifications can, of course, be made
without departing from the spirit of my inven
tion or the scope of the appended claims. '
_I claim:
1. A method of abrading lenses which com- 55
2,129,522
prises rotating an abrading tool in contact with
4.'Lens grinding means comprising a spindle
a lens having substantially the same diameter
carrying a block for supporting a lens, a second
as the abrading surface of the tool, holding
said tool eccentrically with its abrading surface
contacting said lens and with the center of
rotation of the tool positioned ‘substantially at
spindle mounted above the ?rst spindle and in
angular relation thereto, an abrading tool eccen
trically ?xed to said second spindle, said tool
having a substantially continuous spherical sur
the edge ofthe lens, and rotating said lens at
face whose area and diameter are substantially
substantially the same speed of rotation as the
the same as the area ‘and diameter of the lens,
tool.
2. A method of abrading a lens having a
said tool being positioned in contact with the
lens with its center of rotation substantially at
the edge of said lens and means for rotating said
spindles at substantially the same speeds.
5. A method of abrading lenses which com
prises placing a tool in contact with a lens, rotat
ing said tool about an axis which is eccentric 15
to said tool and which passes adjacent the edge
of said lens and rotating said lens at substantially
substantially spherical surface which comprises
placing in contact with said surface an abrading
tool having a spherical surface which has sub-.
stantially the same diameter and area as the sur
face of the lens, rotating said lens about an
axis concentric with said lens and rotating said
tool at substantially the same speed as said lens
about an axis eccentric to said tool, the axis of
rotation of said tool lying substantially in a
21
the same speed as said tool.
carrying shaft, means for mounting a lens con
centrically on said shaft, a tool carrying shaft
6. A method of abrading lenses which com
prises placing a tool in contact with a lens, rotat 20
ing said tool about an axis which is eccentric to
said tool and which passes adjacent the edge
of said lens and rotating said lens at substan-.
positioned with its axis substantially at the edge
tially the same speed as said tool about an axis
line passing through the edge of said lens.
3. Lens abrading apparatus comprising a'lens
25 of ‘said lens, a tool having substantially the
same area and diameter as said lens, means
for mounting said tool eccentrically on said tool
carrying shaft, and means for rotating said two
‘shafts at substantially the same speed.
which is concentric to said lens.
KENNETH C. BURROUGHS.
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