JPS632741B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic polishing apparatus for precision spherical lenses of small and medium diameters, and particularly relates to a spherical center setting mechanism for freely setting the spherical center of a polishing plate.

The lens polishing methods commonly used in the past are two methods: a method in which the lens on the polishing plate is polished by rotating the polishing holder via a holder shaft (kanzashi stick) with a fixed polishing plate; The polishing holder is fixed and the polishing plate is rotated to polish the lens on the polishing plate. In other words, the difference is whether the polishing holder on the upper shaft is rotated or the polishing plate on the lower shaft is rotated. According to the former method, not only does the degree of wear on the polishing plate become extremely high, but it also becomes difficult to polish lenses of stable quality. There was an inconvenience that required adjustment. Therefore, the applicant of the present application has developed a lens polishing apparatus (Japanese Patent Application No. 74289/1989), which was previously filed, after many years of research, and is the latter method. According to this method, compared to the conventional method (described above), not only is no force applied to the polishing plate, but
It is possible to polish a lens of the same quality stably over a long period of time, and it is also easy to make corrections in the event of some trouble. However, with this method, it is not possible to polish a high-precision lens with a small diameter and small radius of curvature, and the speed of the polishing process itself cannot be increased. This is the claimed invention. That is, the present invention improves the conventionally known polishing method and the device previously disclosed by the applicant, in which the polishing holder is fixed and the polishing plate is pressurized, and the polishing holder is fixed and the polishing plate is fixed. In a lens polishing device that rotates and oscillates the support shaft of a polishing plate by applying pressure, a movable holder consisting of a center height adjustment screw screwed onto the polishing plate shaft to adjust the height position of the shaft center, and a spindle shaft. a fixed holder screwed onto the movable holder via a core swing adjustment screw that is screwed together and adjusts the shaft swing, and the polishing plate is adjusted by adjusting the core height adjustment screw and the core swing adjustment screw. By being configured so that the ball core position can be set freely, and by being configured so that pressure is always applied from the vertical direction to the ball core of the polishing dish,
The present invention provides a ball center setting mechanism for a lens polishing device, which is intended to freely adjust the center height and center swing of a polishing plate, and to improve the accuracy and speed of lens polishing.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a ball center setting mechanism in a lens polishing apparatus of the present invention, and 1 is a polishing plate thereof. A polishing plate shaft 2 is integrally formed on the polishing plate 1. Reference numeral 3 denotes a movable holder into which the polishing plate shaft 2 is inserted and slid up and down, and is provided with an adjustment screw 4 for adjusting the height position of the polishing plate 1. 6 is a fixed holder screwed onto the spindle shaft 5;
It is connected to the movable holder 3. Reference numeral 7 denotes a center runout adjustment screw that connects the movable holder 3 to the fixed holder 6 and at the same time adjusts the position of the movable holder 3. This center runout adjustment screw 7 allows the movable holder to be attached and detached freely, and also allows adjustment of the center runout of the spherical center position of the polishing plate. In other words, as is clear from this figure, the movable holder 3
By making the screw hole slightly larger than that of the fixed holder 6, the movable holder 3 can be freely slid back and forth and left and right, and the polishing plate shaft 2 can be freely slid and adjusted, and when the desired position is set, By tightening the center runout adjustment screw 7, the center position of the polishing plate can be set. 8 is a movable base on which the spindle shaft 5 is attached via a bearing 9;
It is formed into an L shape. The movable base 8 is moved through the swing shaft 11 of the base 10 and the bearing 12.
It is designed to swing back and forth. As the movable base 8 swings, the rotating spindle shaft 5 simultaneously swings back and forth. In this manner, the polishing plate 1 is rotated and rocked by the rotation and rocking motion of the spindle shaft 5, and the lens L is automatically polished. In addition, since the lens L is always pressurized in the direction perpendicular to the spherical center of the polishing plate (in the direction of the arrow) by a polishing holder (not shown) with a dial gauge M, the spherical center of the lens L and the polishing plate are Since the ball core is always at a constant position, good polishing can be achieved.

Next, the operation of the present invention will be explained. First, the movable holder 3 into which the polishing plate shaft 2 is fitted is fixed to the fixed holder 6 in a vertical state. Next, the position of the head of the polishing plate 1 is measured using a dial gauge (see Japanese Patent Application No. 57-200234), the distance from the center line of oscillation is calculated, and the measured value of the head and the radius of curvature of the plate are calculated. Slide the polishing plate 1 up and down while operating the center height adjustment screws 4, 4 so that the center height adjustment screws 4, 4 are equal.
4, the polishing plate shaft is fixed to the movable holder 3. Next, leave the dial gauge as it is, tilt the movable base 3 about 30 degrees forward or backward, place the dial gauge measuring needle near the edge of the polishing plate 1, and lightly rotate the spindle shaft 5 with your fingers to remove the polishing plate. 1 and check whether the center of rotation of the polishing plate matches the center of the spindle shaft. If they do not match, adjust the operation using the center runout adjusting screws 7, 7 while sliding the movable holder 3 in the front, back, left and right directions, and when a matching point is found, fix it. In this way, polishing plate 1
By adjusting the center height and center runout, the ball center position can be set freely and accurately.

FIG. 2 shows another embodiment of the polishing plate and movable holder of the present invention. A shows the convex polishing dish 1 shown in FIG. 1, and B and C show the concave polishing dish 1, respectively. (a) By making the polishing plate 1 convex, the lens can be polished while being placed over the polishing plate. B and C are achieved by molding the polishing plate 1 into a concave shape.
It is possible to polish any lens.
The length of the movable holder 3 can be adjusted depending on the length of the polishing plate shaft 2, and the number of holes for the center height adjusting screw 4 can also be two or one. In this way, by making the shape, size, etc. of the polishing plate 1 freely adjustable, and by making it freely insertable and detachable from the movable holder 3, it is possible to easily and conveniently polish a wide variety of lenses for various purposes. .

FIG. 3 shows a comparison between the mechanism of the present invention and the conventional mechanism, with A being the conventional mechanism and B being the present invention. As is clear from this figure, the feature of the conventional mechanism is that the polishing plate A and the spindle B are integrally molded, and the polishing plate A is positioned by moving the movable base up and down. In contrast, the mechanism of the present invention separates polishing plate A and spindle B, connects them freely, leaves the movable base (which is L-shaped in the present invention), and moves only polishing plate A up and down. The polishing plate A is positioned by moving it. As a result, in the conventional method, it is not possible to position the polishing plate for fine adjustment, which not only results in poor polishing but also
is fixed, making high-precision polishing impossible.
It becomes difficult. In contrast, in the present invention, as described above, any fine adjustment is possible, and any lens can be polished with one polishing device.

Since the present invention is constructed as described above, it is possible to perform lens polishing with high precision and high speed, which was conventionally considered impossible and difficult. Furthermore, by freely replacing the polishing plate, it can be used for various types and purposes. Can be applied.
Furthermore, the structure itself is simple and the operation is simple, so it is not only good in terms of performance but also in terms of operation.
It can be said that this is an excellent ball center setting mechanism for lens polishing equipment from all aspects including handling, economy, and practicality.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic explanatory diagram showing the ball center setting mechanism in the lens polishing apparatus of the present invention, FIG. 2 is an enlarged explanatory diagram showing another embodiment of the main part of the mechanism of the present invention, and FIG. FIG. 2 is an explanatory diagram comparing the features of the mechanism of the present invention with a conventional mechanism. 1... Polishing plate, 2... Polishing plate shaft, 3... Movable holder, 4... Center height adjustment screw, 5... Spindle shaft, 6...
Fixed holder, 7... Center runout adjustment screw, 8... Movable base, 9, 12... Bearing, 10... Base, 1
1... Swing axis.

Claims (1)

[Scope of Claims] 1. In a lens polishing device in which a polishing holder is fixed and a polishing plate is pressurized to rotate and swing a supporting shaft of the polishing plate, a center that adjusts the height position of the axis on the polishing plate axis. It consists of a movable holder screwed with a high adjustment screw, and a fixed holder screwed onto the movable holder via a core swing adjustment screw that screws the spindle shaft and adjusts the shaft swing. A ball center setting mechanism for a lens polishing device, characterized in that the ball center position of a polishing plate can be freely set by adjusting a height adjustment screw and a core swing adjustment screw. 2. The spherical center setting mechanism in the lens polishing apparatus according to claim 1, wherein pressure is always applied in a vertical direction to the spherical center of the polishing plate.